No need to specify an update_count_callback for categories or tags, as the...

No need to specify an update_count_callback for categories or tags, as the default handler for them will now be _update_post_term_count(). see #18986, [19035].

git-svn-id: https://core.svn.wordpress.org/trunk@19036 1a063a9b-81f0-0310-95a4-ce76da25c4cd