The UI for these taxonomies was hidden in [31308], but it remained possible to
send a direct POST request to the `inline-edit` endpoint to bypass the
restriction. The current changeset fixes this.
Props meloniq.
Fixes#26948.
Built from https://develop.svn.wordpress.org/trunk@31313
git-svn-id: http://core.svn.wordpress.org/trunk@31294 1a063a9b-81f0-0310-95a4-ce76da25c4cd