[FIX] Tiki API: Fix Item not found 404 response after tracker item update

This MR should fix the issue related to the update operation of tracker items through the Tiki API endpoint: /trackers/{trackerId}/items/{itemId}

i.e. The update operation is still working but returns a 404 error message. This issue (regression) appears to be linked to changes made in the recent MR !2444 (merged)

Error message:

{
    "code": 404,
    "errortitle": "Item not found",
    "message": "Item not found (404)",
    "page": null
}