Don't use scheduled dispatch for predicted times in GUI when disabled

See: #559

src/timetable_gui.cpp

@@ -188,7 +188,7 @@ static void FillTimetableArrivalDepartureTable(const Vehicle *v, VehicleOrderID
 				if (no_offset) SetBit(table[i].flags, TADF_ARRIVAL_NO_OFFSET);
 			}
 
-			if (order->IsScheduledDispatchOrder(true) && !(i == start && !travelling)) {
+			if (HasBit(v->vehicle_flags, VF_SCHEDULED_DISPATCH) && order->IsScheduledDispatchOrder(true) && !(i == start && !travelling)) {
 				if (!no_offset) sum -= v->lateness_counter;
 				extern DateTicksScaled GetScheduledDispatchTime(const DispatchSchedule &ds, DateTicksScaled leave_time);
 				DispatchSchedule &ds = v->orders->GetDispatchScheduleByIndex(order->GetDispatchScheduleIndex());