Include local_part as appservice transaction destination
Headline
Conduit does not send transactions for the appservice itself if local_part of the registration file does not match it.
Description
To be inline with Synapse and Dendrite Conduit should send transactions for appservices for their own local_part, at least when the local user is registered by the appservice.
Most if not all appservices expect this behavior and don't default to having a regex for the local_part when creating a registration file.