Rename black_hole_ga_okashoutengai_(vocaloid)

BUR #48112 has been approved by @evazion.

rename black_hole_ga_okashoutengai_(vocaloid) -> black_hole_gaoka_shoutengai_(vocaloid)

Fixing spaces.

This bulk update request is pending automatic rejection in 5 days.

This bulk update request has been rejected because it was not approved within 45 days.

The bulk update request #48112 (forum #388753) has been rejected by @DanbooruBot.

The bulk update request #48112 (forum #388753) has been approved by @evazion.