修改商品详情页接口判断字段名错误的bug

@@ -1247,7 +1247,7 @@ const _detailDataPkg = (origin, ua) => {
     });
 
   // 品牌信息
-    if (origin.brand) {
+    if (origin.brand_info) {
         let extra = `?productSkn=${origin.product_skn}&brandId=${origin.brand_info.brand_id}`;
 
         dest.preferenceUrl = `/product/detail/preference${extra}`;