Fix setting fonts and colours for wxToggleButton with bitmaps in wxGTK.

Apply the fixes of r54138 to wxToggleButton too, the problem of #3939 was not
specific to just plain wxButtons.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75643 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775