Undo concurrent cleanup exactly

Use the undo_cleanup_concurrent_column_rename to do so

Fixed broken master at https://gitlab.com/gitlab-org/gitlab/issues/32178

db/post_migrate/20190802091750_cleanup_application_settings_snowplow_collector_uri_rename.rb

@@ -12,6 +12,6 @@ class CleanupApplicationSettingsSnowplowCollectorUriRename < ActiveRecord::Migra
   end
 
   def down
-    rename_column_concurrently :application_settings, :snowplow_collector_hostname, :snowplow_collector_uri
+    undo_cleanup_concurrent_column_rename :application_settings, :snowplow_collector_uri, :snowplow_collector_hostname
   end
 end