Core/Objects: added a missing member initialization which sometimes resulted in objects being invisible clientside

How did CI not notice that?

src/server/game/Entities/Object/Object.cpp

@@ -80,6 +80,7 @@ Object::Object() : m_PackGUID(sizeof(uint64)+1)
 
     m_inWorld           = false;
     m_isNewObject       = false;
+    m_isDestroyedObject = false;
     m_objectUpdated     = false;
 }