Fixed obsolete onSceneGuiDelegate > duringSceneGui

Editor/GameViewLink/LinkGameView.cs

         [InitializeOnLoadMethod]
         static void Initialize()
         {
-            SceneView.onSceneGUIDelegate += Update;
+            SceneView.duringSceneGui += Update;
             EditorApplication.playModeStateChanged += OnPlayModeChanged;
         }
 

Editor/SceneViewToolbar.cs

         [InitializeOnLoadMethod]
         static void Initialize()
         {
-           SceneView.onSceneGUIDelegate += OnSceneGUI;
+           SceneView.duringSceneGui += OnSceneGUI;
         }
 
         private static void OnSceneGUI(SceneView sceneView)