[bulk] Mini hat implications

create implication mini_santa_hat -> mini_hat
create implication mini_top_hat -> mini_hat
create implication mini_witch_hat -> mini_hat
create implication mini_witch_hat -> witch_hat

Link to request

I didn't add mini_crown to the list since I'm assuming that crowns are treated differently from hats on Danbooru.

The bulk update request #481 has been approved.