[TASK] Increase the amount of selectable groups

For the fields "Required LDAP groups" and "Local groups to be assigned"

Change-Id: I14479534fe94f89cffeae2a2cd25f366b65a927e
Reviewed-on: http://review.typo3.org/32280
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>