Simplify the method of disabling Vertical tabs with just changing the $form['additional_settings']['#type'] to 'fieldset'

In #1048644: Vertical tabs cannot be disabled, I described a simpler method instead of walking the whole $form array recursively:
https://drupal.org/node/1048644#comment-7822687

Could you change it like this? :) Of course, in your code, without the $form_id variable. This module could possibly be improved by providing a checkbox on the entity editing form (content type, taxonomy vocabulary, etc.) whether the vertical tabs should be disabled or not.