BUG: Update CTK - Filter out readonly directory in Save data dialog.

$ git shortlog b759ef7..0e21d85
Chrystel Juan (1):
      Extend ctkDirectoryButton to optionally filter out readOnly folders.

Jean-Christophe Fillion-Robin (1):
      Merge branch '365-filter-out-read-only-directory'

Fixes #3366

Co-authored-by: Jean-Christophe Fillion-Robin <JChris.FillionR@kitware.com>

From: Chrystel Juan <chrystel.juan@kitware.com>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22474 3bd1e089-480b-0410-8dfb-8563597acbee