fix: mtt-505 (#493)

This fixes the soft synch issue when running a host or client within the editor.

Author: NoelStephensUnity

com.unity.multiplayer.mlapi/Editor/PostProcessScene.cs

@@ -11,6 +11,12 @@ public class NetworkScenePostProcess : MonoBehaviour
         [PostProcessScene(int.MaxValue)]
         public static void ProcessScene()
         {
+            //If we are in playmode (editor or stand alone) we do not want this to execute 
+            if(Application.isPlaying)
+            {
+                return;
+            }        
+        
             List<NetworkedObject> traverseSortedObjects = MonoBehaviour.FindObjectsOfType<NetworkedObject>().ToList();
 
             traverseSortedObjects.Sort((x, y) =>
@@ -57,4 +63,4 @@ internal static List<int> TraversedSiblingIndex(this NetworkedObject networkedOb
             return paths;
         }
     }
-}
+}