rubocop issues - Cleaning up (#8912)

app/models/concerns/omniauthable.rb

config/initializers/open_uri_redirection.rb

lib/mastodon/migration_helpers.rb

spec/controllers/api/salmon_controller_spec.rb

spec/controllers/api/subscriptions_controller_spec.rb

spec/fabricators/user_fabricator.rb

spec/features/log_in_spec.rb

spec/lib/ostatus/atom_serializer_spec.rb

spec/models/status_spec.rb

spec/models/user_spec.rb

spec/rails_helper.rb

spec/services/batched_remove_status_service_spec.rb

spec/services/fetch_remote_account_service_spec.rb

spec/services/process_feed_service_spec.rb

spec/services/update_remote_profile_service_spec.rb