Fix Content-Type for ActivityPub requests #1987
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I was not able to find my nextcloud social account with any of my other fediverse accounts because the Content-Type header sent by the server does not match the ActivityPub spec.
This updates the ActivityPubController to register a responder for
application/ld+json; profile="https://www.w3.org/ns/activitystreams"(defined by the AP spec and used by Mastodon) as well asapplication/activity+json(also considered valid by the spec and used by misskey/sharkey/etc) according to the Accept header of the request.I believe this fixes #1734. (For me webfinger was working, but other AP servers are discarding the response when trying to retrieve the profile because of the incorrect Content-Type header.)