[BUGFIX] Module Icons in be_groups ACL are too big

Resolves: #63154
Releases: master
Change-Id: Iac60dfb271e68d5fa3912412f007be9db9d840b5
Reviewed-on: http://review.typo3.org/34478
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>