webui test: close notification after selinux user map update
    
    The test test_undo_refresh_reset_update_cancel is sometimes
    failing because a notification obscures the selinuxmap record.
    
    After saving the modification on the record, close any notification
    to make sure the test succeeds.
    
    Fixes: https://pagure.io/freeipa/issue/8846
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Anuja More <amore@redhat.com>