Make being hit by an artifact which does fire, cold, or
lightning (or magic missiles, since the code is there) affect
inventory even when the target resists the damage him-/her-/itself.
This removes the need for the redundant fire vs slime handling that
I put in yesterday. Unfortunately it also means that Valkyries who
throw Mjollnir will inevitably end up destroying all their mettalic
wands and rings, so I reduced the chance of it hitting upon its
return.
6f90e5bc8c