Fix some bad UI recursion in `wp_get_archives()` caused by [28379]. It appears that `$afterafter` was appropriately named.

See #22400.


Built from https://develop.svn.wordpress.org/trunk@28534


git-svn-id: http://core.svn.wordpress.org/trunk@28360 1a063a9b-81f0-0310-95a4-ce76da25c4cd