alias kamui gakupo (vocaloid3) -> gackpoid_(vocaloid3)

BUR #18193 has been rejected.

create alias kamui_gakupo_(vocaloid3) -> gackpoid_(vocaloid3)

I noticed the former derivative tag was under the product name instead.

The bulk update request #18193 (forum #247247) has been rejected by @juunigatsu_no_usagi.