BUG: Removed Apply button from draw effect

The Apply button did not work after closing scene. It could have been fixed by keeping track of the slice view on which the user drew last and then call apply on that pipeline, but we decided to remove the Apply button instead, and force the user to use the much simpler mouse right button and Enter key shortcuts

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25735 3bd1e089-480b-0410-8dfb-8563597acbee