[BUGFIX] Content elements in wrong column in page module

If working on workspaces, it might happen that content elements
just appear in the wrong column. The reason is, that live(!)
content elements are selected using a specific column value and
then are overlaid with workspace data.

If the column value has been modified in a workspace, this is
currently just ignored during rendering.

Change-Id: I148ca1b023226f2f99417b3baf238b72346e721f
Fixes: #44470
Releases: 6.1, 6.0, 4.7, 4.6, 4.5
Reviewed-on: https://review.typo3.org/17497
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader