Core/Map: Fix a crash bug when teleporting out of map before being fully added to that map.

Port From (https://github.com/TrinityCore/TrinityCore/commit/6a69dcced2e5bb6227eff28c48c4636cfdb23a1e)

Source/Game/Entities/Player/Player.Map.cs

@@ -150,6 +150,9 @@ namespace Game.Entities
 
         public void UpdateZone(uint newZone, uint newArea)
         {
+            if (!IsInWorld)
+                return;
+
             uint oldZone = m_zoneUpdateId;
             m_zoneUpdateId = newZone;
             m_zoneUpdateTimer = 1 * Time.InMilliseconds;