Imply koala_costume -> animal_costume

BUR #40277 has been approved by @nonamethanks.

create implication koala_costume -> animal_costume

Koalas are animals. At risk of getting on pedants' bad side, this could imply bear_costume instead, which in turn would imply animal_costume.

The bulk update request #40277 (forum #348568) has been approved by @nonamethanks.