Core/Spells: remove some workarounds about transform spells in corpse explosion script.

src/server/game/Entities/Unit/Unit.cpp

@@ -12704,14 +12704,6 @@ void Unit::setDeathState(DeathState s)
     }
     else if (s == JUST_ALIVED)
         RemoveFlag (UNIT_FIELD_FLAGS, UNIT_FLAG_SKINNABLE); // clear skinnable for creature and player (at battleground)
-
-    if (oldDeathState != ALIVE && s == ALIVE)
-    {
-        // Reset display id on resurection - needed by corpse explosion to cleanup after display change
-        // TODO: fix this
-        if (!HasAuraType(SPELL_AURA_TRANSFORM))
-            SetDisplayId(GetNativeDisplayId());
-    }
 }
 
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