Accept "underlinedstrikethrough" in wxFont user strings

Due to a bug fixed in 78145f9162 converting a
font which was both underlined and stricken-through to a user string resulted
in using this space-less version and while the bug is fixed now, still accept
the strings created while it was there on input, it doesn't cost much and
results in a better user experience.

See https://github.com/wxWidgets/wxWidgets/pull/187

src/common/fontcmn.cpp

@@ -981,6 +981,11 @@ bool wxNativeFontInfo::FromUserString(const wxString& s)
         {
             SetStrikethrough(true);
         }
+        else if ( token == wxT("underlinedstrikethrough") )
+        {
+            SetUnderlined(true);
+            SetStrikethrough(true);
+        }
         else if ( token == wxT("light") || token == _("light") )
         {
             SetWeight(wxFONTWEIGHT_LIGHT);