Core/Entities: Use ObjectGuid class in game project

src/server/game/Grids/ObjectGridLoader.cpp

@@ -140,7 +140,7 @@ void LoadHelper(CellCorpseSet const& cell_corpses, CellCoord &cell, CorpseMapTyp
         if (itr->second != map->GetInstanceId())
             continue;
 
-        uint32 player_guid = itr->first;
+        ObjectGuid player_guid(HIGHGUID_PLAYER, itr->first);
 
         Corpse* obj = sObjectAccessor->GetCorpseForPlayerGUID(player_guid);
         if (!obj)