get group pagination does not paginate anymore

[plankes-projects]

GroupObjectDao::paginateGroups

Removed paginate because we now order groups by last_activity_date and not by id. This breaks old paginate implementation.
Update the query such it works again.

we have a list of groups order by actvity (for user 1):
id -> group name
4 -> group 4
3 -> group 3
1 -> group 1
2 -> group 2

paginateGroups(user: 1, limit: 2, lastId: null) shall return:
4 -> group 4
3 -> group 3

paginateGroups(user: 1, limit: 2, lastId: 3) shall return:
1 -> group 1
2 -> group 2

[plankes-projects]

Current client uses a limit of 50. This means we will most likely not hit the pagination functionality. Thus this bug does not have prio.