[CLEANUP] Remove usage of "sys_file_fegroups_mm"

Change-Id: I5afa9b4085f6bf9893cba668ba160ecf1f3e70e4
Releases: 3.0
Resolves: #61221
Reviewed-on: http://review.typo3.org/32429
Reviewed-by: Fabien Udriot <fabien.udriot@ecodev.ch>
Tested-by: Fabien Udriot <fabien.udriot@ecodev.ch>