Core/Pools: Fix handle respawning for nested pools (TrinityCore#31163)

Closes TrinityCore#28524

Author: Jildor

src/server/game/Pools/PoolMgr.cpp

@@ -377,26 +377,14 @@ void PoolGroup<Pool>::Spawn1Object(PoolObject* obj)
     sPoolMgr->SpawnPool(obj->guid);
 }
 
-// Method that does the respawn job on the specified creature
-template <>
-void PoolGroup<Creature>::ReSpawn1Object(PoolObject* obj)
+// Method that does the respawn job on the specified object
+template <typename T>
+void PoolGroup<T>::ReSpawn1Object(PoolObject* obj)
 {
     Despawn1Object(obj->guid, false, false);
     Spawn1Object(obj);
 }
 
-// Method that does the respawn job on the specified gameobject
-template <>
-void PoolGroup<GameObject>::ReSpawn1Object(PoolObject* obj)
-{
-    Despawn1Object(obj->guid, false, false);
-    Spawn1Object(obj);
-}
-
-// Nothing to do for a child Pool
-template <>
-void PoolGroup<Pool>::ReSpawn1Object(PoolObject* /*obj*/) { }
-
 template <>
 void PoolGroup<Creature>::RemoveRespawnTimeFromDB(ObjectGuid::LowType guid)
 {