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

app/models/account.rb

@@ -74,6 +74,14 @@ class Account < ApplicationRecord
   scope :alphabetic, -> { order(domain: :asc, username: :asc) }
   scope :by_domain_accounts, -> { group(:domain).select(:domain, 'COUNT(*) AS accounts_count').order('accounts_count desc') }
 
+  delegate :email,
+    :current_sign_in_ip,
+    :current_sign_in_at,
+    :confirmed?,
+    to: :user,
+    prefix: true,
+    allow_nil: true
+
   def follow!(other_account)
     active_relationships.where(target_account: other_account).first_or_create!(target_account: other_account)
   end