[TASK] EM: Remove contentWrap container

The content wrap container "contentWrap" is removed
as the last memory of tabbed content.

Change-Id: I3d7b54c92a74217917fade99d1edaa4bc640c337
Fixes: #46948
Releases: 6.0, 6.1
Reviewed-on: https://review.typo3.org/19614
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter