wxFont::GetFaceName() could destroy the HFONT used by the font accidentally,
avoid it by not invalidating the font when caching its face name.
Closes#16273.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76595 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775