Keep dialog connected to cross-ref inset after Apply.

This does not actually have any effect yet, due to the fact that
disconnectAfterApply returns true (and this is a GuiDialog).

src/frontends/qt/GuiRef.cpp

@@ -613,6 +613,7 @@ void GuiRef::dispatchParams()
 {
 	std::string const lfun = InsetCommand::params2string(params_);
 	dispatch(FuncRequest(getLfun(), lfun));
+	connectToNewInset();
 }