BUG: Fix inactive button color for dark style

Issue #3251

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22270 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: tmp files with extension .raw were not removed

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22271 3bd1e089-480b-0410-8dfb-8563597acbee