OF-2273: Ensure that self-presence mods are made when joining anon room
When joining a room is configured to restrict presence broadcasts, the reflected 'self-presence' should still have all added annotations as it'd otherwise get.
OF-2276: When a MUC room's config gets changed, send appropriate status codes
As defined by XEP-0045 section 10.2.1 "Notification of Configuration Changes.
