Additional option export contains options from canceled tickets

**Describe the bug**
Export done using the `/events/{eventName}/additional-services/{type}/export` endpoint contain also items from canceled reservations.
The `status` column in `additional_service_item` is set correctly to `CANCELLED` in this case.

**To Reproduce**
Steps to reproduce the behavior:
1. Goto additional options of an events
2. Click on 'Purchased items'
3. Find items of canceled people in the excel

**Expected behavior**
Additional items of people who canceled should be filtered out.

**Additional context**
I think the issue can be fixed with an where clause in `getAdditionalServicesOfTypeForEvent` in `AdditionalServiceItemRepository`. Could try to implement this if the maintainers think that this is the right place.