Codechange: remove loaded_at_xy from CargoPacket as it was unused (#11276)

(cherry picked from commit b0e73277d6)

src/vehicle.cpp

@@ -3386,7 +3386,6 @@ void Vehicle::CancelReservation(StationID next, Station *st)
 		if (cargo.ActionCount(VehicleCargoList::MTA_LOAD) > 0) {
 			DEBUG(misc, 1, "cancelling cargo reservation");
 			cargo.Return(UINT_MAX, &st->goods[v->cargo_type].CreateData().cargo, next);
-			cargo.SetTransferLoadPlace(st->xy);
 		}
 		cargo.KeepAll();
 	}