[BUGFIX] Fix edit links in Backend Usergroup list

Replace T3_THIS_LOCATION with BackendUtility::getModuleUrl() to
fix the broken edit links in "Backend User" > "Backend user groups".

Resolves: #65961
Releases: master
Change-Id: Id5085ad967396e829147325f90d0e4ee037e02f7
Reviewed-on: http://review.typo3.org/38087


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>