fix(inventoryTable): 修正折扣合计计算字段，使用purchaseCount替代totalCount

src/views/purchasingManage/purchaseOrder/components/inventoryTable.vue

@@ -1300,7 +1300,7 @@
       //获取折让合计
       getDiscountTotalPrice(row) {
         let num = 0;
-        num = Number(row.discountSinglePrice) * Number(row.totalCount);
+        num = Number(row.discountSinglePrice) * Number(row.purchaseCount);
         return isNaN(num) ? '' : num.toFixed(2);
       },
       //修改回显