This commit fixes a bug that caused differing dropdown results between AJAX & non-AJAX output, when using the `post_edit_category_parent_dropdown_args` hook.
(That hook is documented inside of the `post_categories_meta_box()` function, introduced via r33682 and #33026.)
Props obiplabon, birgire.
Fixes#44343.
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git-svn-id: http://core.svn.wordpress.org/trunk@59828 1a063a9b-81f0-0310-95a4-ce76da25c4cd