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

spec/controllers/api/v1/timelines/direct_controller_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-RSpec.describe Api::V1::Timelines::DirectController, type: :controller do
+RSpec.describe Api::V1::Timelines::DirectController do
   let(:user)  { Fabricate(:user) }
   let(:token) { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: 'read:statuses') }