Use better method for querying moderation reports on posts and topics

- Also moved the control logic out of the views and into the models

app/models/user.rb

@@ -812,4 +812,8 @@ class User < ApplicationRecord
   def presenter
     @presenter ||= UserPresenter.new(self)
   end
+
+  def viewable_moderation_reports
+    !is_moderator? && CurrentUser.is_moderator? ? moderation_reports : []
+  end
 end