limit TLW size to display size in wxSizer::Fit() instead of doing it in wxTLW::GetMax...

limit TLW size to display size in wxSizer::Fit() instead of doing it in wxTLW::GetMaxSize(), this allows creating or manually resizing TLWs to be larger than the display while still avoiding making them too big by default

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43617 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775