B04002 fix for misplaced pet loyalty

<Someone> wrote:
>This _must_ be a bug: if a character leaves a pet corpse in a
>bonesfile, someone getting those bones will receive
>"So this is how you repay loyalty?"  should he sacrifice it, even
>though the loyalty wasn't shown to _him_."

Clear the appropriate fields from the attached monst structure
when loading bones.

doc/fixes34.2

@@ -99,6 +99,7 @@ stethoscope use should be free the first time it's use per player move
 travel command caches last position to make non-mouse less painful
 update pit trapped time when polymorphing to or from a monster that passes_walls
 show artifact hit message which affect the monster that swallowed the hero
+revived pet corpse from bones file should not be loyal to current player
 
 
 Platform- and/or Interface-Specific Fixes