ARIA tablist fails ariaRoleNotScoped audit

[ricksbrown]

tablist is not required to be contained within any other ARIA role but this test fails:

test('Scope role present - tablist', function() {
    var rule = axs.AuditRules.getRule('ariaRoleNotScoped');
    var fixture = document.getElementById('qunit-fixture');
    var container = fixture.appendChild(document.createElement('ul'));
    container.setAttribute('role', 'tablist');
    for (var i = 0; i < 4; i++) {
        var item = container.appendChild(document.createElement('li'));
        item.setAttribute('role', 'tab');
    }

    var actual = rule.run({ scope: fixture });
    equal(actual.result, axs.constants.AuditResult.PASS);
    deepEqual(actual.elements, []);
});