Update tex2lyx tests

From what I understand, the changes are expected.

src/tex2lyx/test/CJK.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -90,6 +90,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/CJKutf8.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -90,6 +90,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/DummyDocument.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -96,6 +96,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/Dummy~Document.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -96,6 +96,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/XeTeX-polyglossia.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -89,6 +89,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/algo2e.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -88,6 +88,7 @@ algorithm2e
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/beamer.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -89,6 +89,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/box-color-size-space-align.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -125,6 +125,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/listpreamble.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -93,6 +93,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/tabular-x-test.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -92,6 +92,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-insets-basic.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -132,6 +132,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-insets.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -108,6 +108,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-memoir.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -86,6 +86,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-minted.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -85,6 +85,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-modules.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -86,6 +86,7 @@ theorems-ams
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-refstyle-theorems.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -86,6 +86,7 @@ theorems-ams
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-scr.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -83,6 +83,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/test-structure.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -120,6 +120,7 @@ logicalmkup
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \author -443692588 "Hans Wurst"
 \end_header
 

src/tex2lyx/test/test.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -90,6 +90,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body

src/tex2lyx/test/verbatim.lyx.lyx

@@ -1,5 +1,5 @@
 #LyX file created by tex2lyx 2.5
-\lyxformat 630
+\lyxformat 631
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -79,6 +79,7 @@
 \html_be_strict false
 \docbook_table_output 0
 \docbook_mathml_prefix 1
+\docbook_mathml_version 0
 \end_header
 
 \begin_body