修复storage错写为storage_number导致的加价购和赠品添加错误的bug

Code Review By Rock Zhang

@@ -680,7 +680,7 @@ class CartModel
                         $sizeList[$val['product_skc']][] = $oneSize;
 
                         // 所有尺码列表，赋值用于前端展示默认尺码的时候 判断出没有库存则显示灰色
-                        $allSizeList[$sizeName] = empty($allSizeList[$sizeName]['storage_number'])
+                        $allSizeList[$sizeName] = empty($allSizeList[$sizeName]['storage'])
                             ? array('storage' => $one['storage_number'], 'id' => $one['size_id'])
                             : $allSizeList[$sizeName];