adjust to the changes in dialog.js and set the option to <h2>

Author: rpkoller

tests/unit/dialog/core.js

@@ -122,7 +122,7 @@ QUnit.test( "ui dialog title tagname", function( assert ) {
 
 	var element, wrapper;
 
-	element = $( "<div>" ).dialog( { modal: true, uiDialogTitleTagName: "h2" } );
+	element = $( "<div>" ).dialog( { modal: true, uiDialogTitleTagName: "<h2>" } );
 	wrapper = document.querySelector( ".ui-dialog-title" );
 	assert.equal( wrapper.tagName, "h2", "The dialog title element is h2" );
 } );