update 退团，没有报名订单处理

mec-biz/src/main/java/com/ym/mec/biz/service/impl/StudentRegistrationServiceImpl.java

@@ -519,7 +519,8 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
             throw new BizException("排队人数过多，请重试");
         }
         if (paidZeroFlag) {
-            studentPaymentOrder.setPaymentAccountNo(firstPaidZeroFlag ? "200" : "205");
+            String code = firstPaidZeroFlag ? "200" : "205";
+            studentPaymentOrder.setPaymentAccountNo(code);
             studentPaymentOrderService.update(studentPaymentOrder);
         }
         return studentPaymentOrder;