This sample already included sample.xpm even before the recent changes
replacing mondrian.xpm (which it also included) inclusion with sample.xpm so
now it included it twice.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64726 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775