fix[litemall-wx]: 立即购物时仍然下单购物车所有商品。

litemall-wx/pages/shopping/checkout/checkout.js

@@ -101,7 +101,7 @@ Page({
       util.showErrorToast('请选择收货地址');
       return false;
     }
-    util.request(api.OrderSubmit, { cartId: 0, addressId: this.data.addressId, couponId: this.data.couponId }, 'POST').then(res => {
+    util.request(api.OrderSubmit, { cartId: this.data.cartId, addressId: this.data.addressId, couponId: this.data.couponId }, 'POST').then(res => {
       if (res.errno === 0) {
         const orderId = res.data.orderId;