[BUGFIX] List module - backend layout - moving content elements

When moving a content element in the List module by clicking on
the "Re-position content element" icon, an user is presented with
the old 4 columns instead of columns that would represent the newly
introduced backend layout as it is appearing in the Page module.

Change-Id: Ie8120784b0ccb9036d012437cae966de3484f1e6
Fixes: #M17529
Reviewed-on: http://review.typo3.org/1040


Reviewed-by: Andreas Wolf <andreas.wolf@ikt-werk.de>
Tested-by: Andreas Wolf <andreas.wolf@ikt-werk.de>