Fixes ZF-12156, removed f before opening php tag

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@24710 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Feed/Writer/Deleted.php

@@ -1,4 +1,4 @@
-f<?php
+<?php
 /**
  * Zend Framework
  *