[CLEANUP] Remove superfluous ContainerViewHelper

The ContainerViewHelper in EXT:beuser is removed due to identical
functionality introduced in Ie8464963eb421eca65c0a3c750920037bcee78bc.

Resolves: #64053
Related: #63913
Releases: master
Change-Id: Ic918a090c605a01a63de6b46d45e91fb4a2378e9
Reviewed-on: http://review.typo3.org/35662
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>