This change makes form fields rendered by

djblets_forms/admin/form_field.html and Django's own

admin/includes/fieldset.html render closer together by wrapping the

contents of the field inside a <div>. This allows us to render

admin-styled forms (e.g., .aligned.module fieldsets) without being too

hacky.

Tested this with an upcoming patch for Review Board.
Did not notice changes in fields that are rendered with this template.