For some reason (rename of the old wxTHICK_FRAME to wxRESIZE_BORDER?) we
tested for wxRESIZE_BORDER twice in a couple of places. Don't do it for
clarity.
Closes#14264.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71345 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775