[优化]优惠券导出为CSV格式

mallinkService/src/main/java/com/iformall/service/impl/WxCouponOrderServiceImpl.java

@@ -314,7 +314,7 @@ public class WxCouponOrderServiceImpl implements WxCouponOrderService {
                 }
             }
         });
-        excelService.exportCsv(list, null, filename, WxCouponOrderBVo.class, filename + ".xlsx", response, false);
+        excelService.exportCsv(list, null, filename, WxCouponOrderBVo.class, filename + ".csv", response, false);
     }
 
     @Override