missed(?) arthropod boy alias'

BUR #48000 has been approved by @evazion.

create alias bug_boy -> arthropod_boy
create alias bugboy -> arthropod_boy

identical to arthropod girl's three alias': bug_girl, buggirl and insect_girl
(insect_boy is already alias'd to arthropod_boy)

The bulk update request #48000 (forum #388460) has been approved by @evazion.