[A14D] Arctic foxskin doesn't get insulation bonus

[theaetetus]

Looking at the arctic fox's def and then dev moding in an artic fox to butcher one, I noticed it doesn't get a insulation bonus.

I believe it was intended to have one and was just a simple oversight.

Timber wolfskin - 100% insulation
Arctic wolfskin - 125% insulation

Red foxskin - 100% insulation
Fennec foxskin - 100% insulation
Arctic foxskin - 100% insulation

Edit: polarbearskin seems to have the same issue.