Alias kuroboshi_kouhaku_(vtuber) -> roroboshi-chan

The bulk update request #13663 has been approved by @nonamethanks.

create alias kuroboshi_kouhaku_(vtuber) -> roroboshi-chan

This is the proper name of his artist avatar/original character.

The bulk update request #13663 (forum #227581) has been approved by @nonamethanks.