[BUGFIX] Every LDAP group is imported and assigned to user

Fixes: #60240
Change-Id: I142db4430517936318b9e45c392f19e0acd2c60f
Reviewed-on: http://review.typo3.org/31567
Reviewed-by: Thierry Brodard <thierry.brodard@techniconcept.ch>
Tested-by: Thierry Brodard <thierry.brodard@techniconcept.ch>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>