[9943] Add a small delay for npc despawn related to spell 51840

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m src/game/SpellEffects.cpp

m src/shared/revision_nr.h



[9943] Add a small delay for npc despawn related to spell 51840



This will solve problem with summoned GO that does not appear before later, but 

does not solve problem with visual effects (which is a generic problem with many 

spells).



Signed-off-by: NoFantasy 

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