Repeal the "Japanese art only" rule in /d/

Seriously, it's a legacy from back when 4chan was only a weaboo anime board and it goes counter of /d/'s internal culture of being tolerant of eachothers' individual kinks.

Keep this Japanese only shit for /a/ and /h/.

Dmitrys is (or *was*) "pretty fucking popular" because he used to visit /d/ a lot. We made an exception for him, newfag.