Removes one item from a listing's content section. On an active listing, the item is removed from the partner's draft version, so the live listing keeps it until the draft is approved; you can pass the item ID from the active listing and it is matched to the same item in the draft. If the item cannot be found or matched, the response is 422 and lists the draft's current items and their IDs. Requires the listings_update permission (not listings_delete).