+CanSwitch2SelfDeliver，美团预定单是不能转自送的

减小转自送失败尝试时间间隙至3秒（以免出现不能取消三方运单的情况）

business/partner/purchase/mtwm/order.go

@@ -468,6 +468,11 @@ func (p *PurchaseHandler) ConfirmReceiveGoods(ctx *jxcontext.Context, order *mod
 	return err
 }
 
+// 美团预定单不能转商家自送
+func (c *PurchaseHandler) CanSwitch2SelfDeliver(order *model.GoodsOrder) (isCan bool, err error) {
+	return order.BusinessType != model.BusinessTypeDingshida, nil
+}
+
 func (c *PurchaseHandler) Swtich2SelfDeliver(order *model.GoodsOrder, userName string) (err error) {
 	globals.SugarLogger.Debugf("mtwm Swtich2SelfDeliver orderID:%s", order.VendorOrderID)
 	if globals.EnableMtwmStoreWrite {