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.

src/restore.c

@@ -974,6 +974,7 @@ boolean ghostly;
 	    struct monst *mtmp = (struct monst *)otmp->oextra;
 
 	    mtmp->m_id = 0;
+	    mtmp->mpeaceful = mtmp->mtame = 0;	/* pet's owner died! */
 	}
 	if (ghostly && otmp->oattached == OATTACHED_M_ID) {
 	    (void) memcpy((genericptr_t)&oldid, (genericptr_t)otmp->oextra,