[9392] Update creature/gameobject pool at despawn instead spawn prepare.

[newsbot]

<pre>m src/game/Creature.cpp
m src/game/GameEventMgr.cpp
m src/game/GameObject.cpp
m src/game/PoolManager.cpp
m src/game/PoolManager.h
m src/shared/revision_nr.h

[9392] Update creature/gameobject pool at despawn instead spawn prepare.

This let solve problem with not despawned creature/gameobject at pool update in case when related grid not loaded.

Signed-off-by: VladimirMangos <vladimir@getmangos.com></pre>



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