We rejoin after registration to make sure that the user is identified and has
all their user modes set and whatever. We don't actually have a way to do this
right now, but plugins can tie into the signal for that.
Testing Done:
Joined some channels on my local ergo, disconnected the account in the account manager, re-enabled it, and verified via another client that I rejoined those channels.
Reviewed at https://reviews.imfreedom.org/r/2829/
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