Remove TODO from the Delegated presenter

This TODO only exists in EE, and since it's a TODO there's no real point
in backporting it. As such we'll just get rid of it.

lib/gitlab/view/presenter/delegated.rb

@@ -3,7 +3,6 @@
 module Gitlab
   module View
     module Presenter
-      # TODO: find a way to delegate calls to `class` methods to the subject's class; see gitlab-ce/#57299
       class Delegated < SimpleDelegator
         include Gitlab::View::Presenter::Base