[BUGFIX] Error after hide/show element in list module

Showing or hiding an element with workspace selected will result in
Error: Could not be edited in offline workspace...

Change-Id: I43ceaf2443dff7c3d666811726353f3b17b81182
Resolves: #20598
Releases: 4.7, 4.6, 4,5
Reviewed-on: http://review.typo3.org/5633
Reviewed-by: Georg Ringer
Reviewed-by: Simon Schaufelberger
Tested-by: Simon Schaufelberger
Reviewed-by: Francois Suter
Tested-by: Francois Suter