When using the traditional list view of the categories,

make sure the wp_list_categories() doesn't add in another title. This
was causing a second Categories to show up on the category widget.  Props Jospeh Scott

git-svn-id: https://develop.svn.wordpress.org/trunk@5356 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/widgets.php

@@ -552,7 +552,7 @@ function wp_widget_categories($args) {
 	} else {
 ?>
 		<ul>
-		<?php wp_list_categories($cat_args); ?>
+		<?php wp_list_categories($cat_args . '&title_li='); ?>
 		</ul>
 <?php
 	}