imply polearm to spear

BUR #5985 has been approved by @evazion.

create implication holding_spear -> holding_polearm

spear implicates polearm but not for the holding lol

You scared me with the titel, its spear to polearm...

Is de-implicating holding_weapon necessary after this?

The bulk update request #5985 (forum #189534) has been approved by @evazion.