update: 获取班级人数来源

mooctest-site-server/src/main/java/cn/iselab/mooctest/site/web/logic/impl/GroupLogicImpl.java

@@ -146,7 +146,7 @@ public class GroupLogicImpl extends BaseLogic implements GroupLogic {
             throw new HttpNotFoundException(String.format("Group[id=%s] doesn't exist", groupId));
         }
         GroupVO groupVO = Converter.convert(GroupVO.class,group);
-        groupVO.setWorkerCount(this.getManagerWorkersInGroup(groupId).size());
+        groupVO.setWorkerCount(groupService.getWorkerCount(groupId));
         return groupVO;
     }