class differentiation followup

> Healers pick up on the fact that a wand of undead turning
> revived a creature.
...if a vital piece of code isn't accidentally left out

doc/fixes35.0

@@ -45,6 +45,8 @@ many instances of physical damage were not taking Half_physical_damage
 	into account when reducing your hitpoints
 make it possible for the code to recognize your starting pet throughout the 
 	game via is_starting_pet(mon) macro
+healers notice when a wand of undead turning revives a monster so the
+	wand is then identified
 
 
 Platform- and/or Interface-Specific Fixes

src/zap.c

@@ -1573,6 +1573,7 @@ struct obj *obj, *otmp;
 			    		s_suffix(an(mons[corpsenm].mname)),
 					nonliving(&mons[corpsenm]) ?
 					"motility" : "health");
+				u_noticed = TRUE;
 			    }
 			    if (u_noticed) {
 				    makeknown(otmp->otyp);