disconnectClientTemporarily removed an over-limit client from the core
and re-added the snapshot the scan had loaded 100 ms later, so a
disable or detach committed in between was undone: the traffic job's
own RemoveUser had already found nothing, and the disabled account
stayed live in Xray until the next restart.
The re-add now rereads the client and its inbound and skips one that
is disabled, expired, over quota or no longer attached.