make sure legacy scene works same as before

Assets/Scenes/SampleScene.unity

     m_PVRFilteringAtrousPositionSigmaAO: 1
     m_ShowResolutionOverlay: 1
   m_LightingDataAsset: {fileID: 0}
-  m_UseShadowmask: 1
+  m_UseShadowmask: 0
 --- !u!196 &4
 NavMeshSettings:
   serializedVersion: 2
   m_EditorClassIdentifier: 
   m_UseCustomMaterial: 0
   m_CustomMaterial: {fileID: 2100000, guid: e77eba92b3f8949a8ba25b8d98a8f694, type: 2}
-  m_UseCustomRendererAsset: 1
+  m_UseCustomRendererAsset: 0
   m_CustomRendererAsset: {fileID: 11400000, guid: 2310b94e2d8f5463ab592fa99eefbe6f, type: 2}
 --- !u!20 &282840813
 Camera: