fix更新勋章

mooctest-user-server/src/main/java/cn/iselab/mooctest/user/web/logic/impl/MedalLogicImpl.java

@@ -58,7 +58,7 @@ public class MedalLogicImpl extends BaseLogic implements MedalLogic {
         medal.setName(dto.getName());
         medal.setDescription(dto.getDescription());
         medal.setImgUrl(dto.getImgUrl());
-        medalService.saveMedal(medal);
+        medalService.updateMedal(medal);
         return dto;
     }