feat：监测器删除接口返回信息修改

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/service/impl/GardsDetectorsServiceImpl.java

@@ -124,6 +124,6 @@ public class GardsDetectorsServiceImpl extends ServiceImpl<GardsDetectorsMapper,
         queryWrapper.eq(GardsDetectors::getDetectorId, id);
         this.baseMapper.delete(queryWrapper);
         result.success("删除成功");
-        return null;
+        return result;
     }
 }