COMP: Update CTK to fix build warnings

$ git shortlog 1dbffd..48ef9aeb --no-merges
Jean-Christophe Fillion-Robin (2):
      Fix warning complaining about missing resource with resource list is empty.
      Fix unused variable warnings

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23342 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Fix Slicer build warnings

This commit addresses two types of warnings:
 - unused variable warnings
 - RCC: Warning: No resources in '/path/to/foo.qrc

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23343 3bd1e089-480b-0410-8dfb-8563597acbee