Fix appearance of custom drawn wxToggleButton in wxMSW.

Ensure that the owner-drawn toggle buttons are drawn in the pressed state when
they are pressed, even if they are also selected or under mouse.

Closes #11665.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76790 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775