Fix an error in SQL generation when `perm` is set and an array is passed for `post_status`. Adds unit test.

Props oso96_2000.
Fixes #25523.


Built from https://develop.svn.wordpress.org/trunk@27067


git-svn-id: http://core.svn.wordpress.org/trunk@26940 1a063a9b-81f0-0310-95a4-ce76da25c4cd