Remove a stray setActor() on EdgeEditor

Summary: These got removed recently but I missed one callsite.

Test Plan: Used `git grep` to double check all other callsites.

Reviewers: joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D9973

src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php

@@ -2342,8 +2342,7 @@ abstract class PhabricatorApplicationTransactionEditor
       return;
     }
 
-    $editor = id(new PhabricatorEdgeEditor())
-      ->setActor($this->getActor());
+    $editor = new PhabricatorEdgeEditor();
 
     $src = $object->getPHID();
     $type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_FILE;