Fix most rubocop issues (#2165)

* Run rubocop --autocorrect on app/, config/ and lib/, also manually fix some remaining style issues

* Run rubocop --autocorrect-all on db/

* Run rubocop --autocorrect-all on `spec/` and fix remaining issues

app/serializers/activitypub/note_serializer.rb

@@ -32,6 +32,7 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
 
   def id
     raise Mastodon::NotPermittedError, 'Local-only statuses should not be serialized' if object.local_only? && !instance_options[:allow_local_only]
+
     ActivityPub::TagManager.instance.uri_for(object)
   end