Don't return italic/bold suffix from wxFont::GetFaceName() in wxMSW.

These suffixes don't make part of the face name in wx API but the native MSW
API which we use since r62675 does return them. This made the unit test fail
in SettingsTestCase::GlobalFonts() as a face name with such suffix wasn't
recognized as a valid face name any more, so simply remove them.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62708 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775