Wrong weight of corpses on special levels

Incorporate a fix from <Someone> related to slashem-Bugs-916544.  The
weight was not recalcuated after changing the corpsenm.

doc/fixes34.4

@@ -25,6 +25,7 @@ be consistent with use of "removing" rather than "lifting" for encumber
 	messages associated with taking things out of a bag of holding
 cursed scroll of destroy armor damaging cursed armor didn't adjust attributes
 add passive() flag that indicates uwep was destroyed during the turn
+calculate weight of corpses on special levels correctly
 
 
 Platform- and/or Interface-Specific Fixes

src/sp_lev.c

@@ -963,8 +963,11 @@ struct mkroom	*croom;
 	}
 
 	/*	corpsenm is "empty" if -1, random if -2, otherwise specific */
-	if (o->corpsenm == NON_PM - 1) otmp->corpsenm = rndmonnum();
-	else if (o->corpsenm != NON_PM) otmp->corpsenm = o->corpsenm;
+	if (o->corpsenm != NON_PM) {
+	    if (o->corpsenm == NON_PM - 1) otmp->corpsenm = rndmonnum();
+	    else otmp->corpsenm = o->corpsenm;
+	    otmp->owt = weight(otmp);
+	}
 
 	/* assume we wouldn't be given an egg corpsenm unless it was
 	   hatchable */