fix 课程余额变动，操作用户null

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

@@ -140,7 +140,6 @@ public class SporadicChargeInfoImpl extends BaseServiceImpl<Integer, SporadicCha
         }
         if (studentPaymentOrder.getStatus() == DealStatusEnum.CLOSE || studentPaymentOrder.getStatus() == DealStatusEnum.FAILED) {
             if (info.getMaxNum() != null && info.getPaidNum() > 0) {
-                info = sporadicChargeInfoDao.get(info.getId());
                 info.setPaidNum(info.getPaidNum() - 1);
                 info.setUpdateTime(new Date());
                 int update = sporadicChargeInfoDao.update(info);