Accordion: Remove IE6/7 specific workaround in demos

Author: arschmitz

demos/accordion/sortable.html

@@ -7,10 +7,6 @@
 	<link rel="stylesheet" href="../demos.css">
 	<script src="../require-config.js"></script>
 	<script src="../../external/requirejs/require.js"></script>
-	<style>
-	/* IE has layout issues when sorting (see #5413) */
-	.group { zoom: 1 }
-	</style>
 	<script src="../bootstrap.js" data-modules="sortable">
 		$( "#accordion" )
 			.accordion({