The "*" wildcard was never in assignablePermissions, so an operator holding it
(the one the first-run wizard creates) showed every box unticked while having
every right, and there was no way to take it away. Its own row fixes both; the
grid is disabled while it is on, since normalisePermissions collapses "*" plus
anything back to "*".
That made guardManagerRemoval reachable from the UI for the first time, so it
now has an integration test covering the wildcard match and the enabled filter
in its SQL.
