Fix "Reload with full diff" button not working

Closes #431

CHANGELOG-EE

@@ -5,6 +5,7 @@ v 8.7.0 (unreleased)
   - Refactor group sync to pull access level logic to its own class. !306
 
 v 8.6.3 (unreleased)
+  - Fix "Reload with full diff" button not working (Stan Hu)
   - Exit ElasticIndexerWorker's job happily if record cannot be found. !311
 
 v 8.6.2

app/helpers/emails_helper.rb

@@ -50,10 +50,4 @@ module EmailsHelper
     msg = "This link is valid for #{password_reset_token_valid_time}.  "
     msg << "After it expires, you can #{link_tag}."
   end
-
-  # Overrides
-
-  def diff_hard_limit_enabled?
-    false
-  end
 end