FIX: flaky groups_controller_spec (PR #9438)

Sometimes spec which is testing order groups by user count is failing.

My theory is that cause is the randomness of Postgres when the order value is the same for 2 rows.

In spec, we got three groups moderator_group - 0 users group - 1 user other_group - 1 user

And we are expecting that controller will return them in ascending order [moderator, group, other_group]

Because group and other_group contain the same amount of users, we are dealing with luck

Therefore, I believe that adding one more user to other_group should make that query reliable.

It was not crashing on my local machine, so I am not 100% sure.