fix: 导入招标/投标接口文件，点击清单工程量三小点，工程量表达式为空

BUG #3136

web/building_saas/standard_interface/import/base.js

@@ -299,6 +299,9 @@ const INTERFACE_EXPORT_BASE = (() => {
         if (!child.ID) {
           child.ID = uuid.v1();
         }
+        if (child.quantity) {
+          child.quantityEXP = child.quantity;
+        }
         child.ParentID = parentID;
         child.type = parentID === -1 ? BillType.DXFY : BillType.BILL;
         child.NextSiblingID = -1;