fix org owner cannot be removed if there is not in owner team (#3164)

models/org.go

@@ -453,9 +453,14 @@ func RemoveOrgUser(orgID, userID int64) error {
 			return err
 		}
 		if t.NumMembers == 1 {
+			if err := t.GetMembers(); err != nil {
+				return err
+			}
+			if t.Members[0].ID == userID {
 				return ErrLastOrgOwner{UID: userID}
 			}
 		}
+	}
 
 	sess := x.NewSession()
 	defer sess.Close()