More controller specs (#2561)

* Add render_views in more places

* Delegate methods from account to user with allow nil true, so that admin accounts show view renders when missing a user

* Use actual account instances in authorize follow controller spec

spec/controllers/admin/pubsubhubbub_controller_spec.rb

@@ -2,6 +2,8 @@
 require 'rails_helper'
 
 RSpec.describe Admin::PubsubhubbubController, type: :controller do
+  render_views
+
   describe 'GET #index' do
     before do
       sign_in Fabricate(:user, admin: true), scope: :user