Fix tex2lyx tests for 23e8db3e5

The textcyr test did not work anymore, since the output of
"CYRILLIC SMALL LETTER VE" changed from \textcyr{\char226} to \textcyr{\cyrv}.
The the old version is now converted to ERT. In theory it could also be
converted to "CYRILLIC SMALL LETTER VE", but this would mean to maintain an
extra list, which is not worth the effort.

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

@@ -454,7 +454,7 @@ from textcomp:
 \textnumero\texttrademark
 
 from textgreek and textcyr:
-\textgreek{>a}\textcyr{\char226}
+\textgreek{>a}\textcyr{\cyrv}
 
 from subscript:
 \textsubscript{4}