Battlegrounds/WSG: Fixed door LoS in Warsong Gulch

Closes #6147
Signed-off-by: Subv <s.v.h21@hotmail.com>

src/server/game/Entities/GameObject/GameObject.cpp

@@ -138,7 +138,7 @@ void GameObject::AddToWorld()
         bool toggledState = GetGoState() == GO_STATE_READY;
         if (m_model)
             GetMap()->Insert(*m_model);
-        if ((startOpen && !toggledState) || (!startOpen && toggledState))
+        if (startOpen ^ toggledState)
             EnableCollision(false);
 
         WorldObject::AddToWorld();