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