* 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
* Remove duplicate in_chosen_languages definition
* Use `DEFAULT_FIELDS_SIZE` instead of `MAX_FIELDS` to reduce code differences with upstream
* Remove duplicate annotation
* Fix incorrect cross-flavor imports
* Remove deprecated `hide_network` setting (replaced by account column)
* Remove unused KeywordMutesHelper
* Remove trailing spaces
* Remove commit_hash from InstancePresenter, as it has been unused since mid-2017
Sidekiq sometimes throws errors for users that have more pinned items
than the allowed by the local instance. It should only validate the
number of pins for local accounts.