Replace call to undefined renderHandleLink() with renderHandle().
Additionally, pass head_key($new) instead of key($new). This might not be needed strictly speaking for this very issue but should not harm either as several images in a mock can be renamed at once.
EXCEPTION: (Error) Call to undefined method PholioImageSequenceTransaction::renderHandleLink() at [<phorge>/src/applications/pholio/xaction/PholioImageSequenceTransaction.php:32]
Closes T15680