Tests: Add link to selectmenu in unit index

Author: scottgonzalez

tests/unit/index.html

@@ -44,6 +44,7 @@ <h2>Widgets</h2>
 			<li><a href="dialog/dialog.html">Dialog</a></li>
 			<li><a href="menu/menu.html">Menu</a></li>
 			<li><a href="progressbar/progressbar.html">Progressbar</a></li>
+			<li><a href="selectmenu/selectmenu.html">Selectmenu</a></li>
 			<li><a href="slider/slider.html">Slider</a></li>
 			<li><a href="spinner/spinner.html">Spinner</a></li>
 			<li><a href="tabs/tabs.html">Tabs</a></li>