Merge pull request #213 from Unity-Technologies/Branch_FixNewMaterial

Fixed the stencil ref default value for lit/littesselation shaders. Wrong value was causing new materials to be black until changed.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 1
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 1
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0