BUG: Use Slicer VTK components in SlicerConfig. Fixes #3872

This commit revert r23755 and ensure extension will find only the
VTK components required by Slicer itself.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23766 3bd1e089-480b-0410-8dfb-8563597acbee