Don't include wxUniversal configurations in MSVC project files.

wxUniversal is practically not used under MSW and just confuses people.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73427 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix background drawing in EVT_ERASE_BACKGROUND handler in erase sample.

Clear the DC before moving its offset to ensure that it's cleared entirely and
also draw the background using the virtual, not client, size.

See #14917.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73428 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775