Export of my starred sessions is not working

The export of my starred sessions is no longer working. It offers a download and the code then shows "Page not found".

Previous PR introducing this feature: https://github.com/fossasia/eventyay-video/pull/215

<img width="2340" height="802" alt="Image" src="https://github.com/user-attachments/assets/62144acb-ddcb-4505-98ab-abea98999bbd" />