In wp_list_bookmarks(), don't stomp the categorize argument. Fixes categorized...

In wp_list_bookmarks(), don't stomp the categorize argument. Fixes categorized display in the links widget.

fixes #22216


git-svn-id: https://core.svn.wordpress.org/trunk@22910 1a063a9b-81f0-0310-95a4-ce76da25c4cd