fix bug: two group owners

internal/rpc/group/group.go

@@ -902,7 +902,7 @@ func (s *groupServer) JoinGroup(ctx context.Context, req *pbGroup.JoinGroupReq)
 			return &pbGroup.JoinGroupResp{CommonResp: &pbGroup.CommonResp{ErrCode: constant.ErrDB.ErrCode, ErrMsg: constant.ErrDB.ErrMsg}}, nil
 		}
 		//to group member
-		groupMember := db.GroupMember{GroupID: req.GroupID, RoleLevel: constant.GroupOwner, OperatorUserID: req.OpUserID, JoinSource: req.JoinSource}
+		groupMember := db.GroupMember{GroupID: req.GroupID, RoleLevel: constant.GroupOrdinaryUsers, OperatorUserID: req.OpUserID, JoinSource: req.JoinSource}
 		utils.CopyStructFields(&groupMember, us)
 		err = imdb.InsertIntoGroupMember(groupMember)
 		if err != nil {