* Fix uncaching worker
* Revert to using Paperclip's filesystem backend instead of fog-local
fog-local has lots of concurrency issues, causing failure to delete files,
dangling file records, and spurious errors UncacheMediaWorker
* Speed up some rake tasks by moving execution to Sidekiq
mastodon:media:remove_silenced
mastodon:media:remove_remote
mastodon:media:redownload_avatars
mastodon:feeds:build
* Fix code style issue