Continued VTuber cleanup [BUR]

The bulk update request #55261 (forum #420000) has been approved by @evazion.

~Posted wrong thread sorry~

BUR #58651 has been approved by @nonamethanks.

create alias squchan_(vtuber) -> shyrei_faolan
create alias shondo_(vtuber) -> fallenshadow

Suggested in comment #2596209.

The bulk update request #58651 (forum #436642) has been approved by @nonamethanks.