Revisions: Mark deprecated arguments in `wp_list_post_revisions()`.

* Second argument is now a string, which controls the revision type
* Back compat for $args['type']
* Remove lines for the old form-table format, since it's now just a list 

props a.hoereth. fixes #24213.

git-svn-id: http://core.svn.wordpress.org/trunk@24175 1a063a9b-81f0-0310-95a4-ce76da25c4cd