Nextcloud: Business/Functional logic bypass: Remove admins from admin group.

In nextcloud the default admin can not be removed from his admin group. The group toggle request looks like this: POST /nextcloud/index.php/settings/ajax/togglegroups.php HTTP/1.1 Host: 139.59.9.184 User-Agent: Mozilla/5.0 Macintosh; Intel Mac OS X 10.11; rv:47.0 Gecko/20100101 Firefox/47.0 Accep...