Touhou - Parka Girls Conversion/Nuke

BUR #59012 has been approved by @evazion.

convert pool:486 -> parka_girls_(touhou)

Old pixiv project based on responses to post #378059.

BUR #59013 has been rejected.

nuke pool:486

Option to nuke.

The bulk update request #59013 (forum #437959) has been rejected by @evazion.

The bulk update request #59012 (forum #437958) has been approved by @evazion.

It's just an old meme, there's no reason to nuke it.