[LyX/master] Remove two remaining snippets from the QRegExp era.

[Jürgen Spitzmüller]

Am Samstag, dem 11.03.2023 um 10:27 -0500 schrieb Scott Kostyshak:
> This compiles on my new system, but fails on an old system, with both
> CMake and Autotools.
> 
> CategorizedCombo.cpp: In member function ‘void
> lyx::frontend::CategorizedCombo::Private::setFilter(const QString&)’:
> CategorizedCombo.cpp:290:16: error: ‘class
> lyx::frontend::CCFilterModel’ has no member named
> ‘setFilterRegularExpression’
>   filterModel_-
> >setFilterRegularExpression(charFilterRegExp(filter_));
>                 ^

filterRegularExpression was introduced in Qt 5.12.

> 
> GCC version: 5.4.0
> Qt version:  5.5.1
> 
> I forget what our minimum current versions are these days. I do not
> mind if compilation doesn't work for this old system.

Readme says "at least version 5.2 (5.6 recommended)".

-- 
Jürgen
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