Deny reupload permission to users and autoconfirmed on ckbwiki

This is a followup to I7a651f1ff738afe1a42e05c70f17dc61df02dab2.
The change in the present changeset was requested in the bug, but
not actually carried out in the last changeset.

Bug: 51232
Change-Id: I7e21ae20fb967c25411d453d4dbf56ce0c1570c9