snarfed / bridgy / 8810e765-1f97-4e09-b408-c539a3549e4a

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circleci

fix Mastodon OAuth scopes across logins

fixes #1531. this one was tricky, tried a number of solutions before I settled on this.
* when adding backfeed to an existing user, include publish feature if it's already on. this makes sure we request scopes for both.
* if SCOPES_RESET is True, when re-authing, only turn on the feature we added. don't merge in any of the others since we didn't request scopes for them.
* warn in util.maybe_add_or_delete_source that it redirects, so any code after it won't run.
* c4cff7661: show already logged in accounts on Mastodon login "choose instance" page. this should minimize unnecessary re-auths when someone's just trying to find their existing user page.

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