That should fix editing of membergroups

Signed-off-by: emanuele <emanuele45@gmail.com>
There is no reason not to set admin preferences for everybody (see manage permissions without admin rights)

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #622 from emanuele45/fix_membergroups

Fix membergroups
Sorry, but I need that one badly at the moment... :angel: