HDRenderPipeline: Fix issue in aniso material

Assets/TestScenes/HDTest/Material/HDRenderLoopMaterials/GGX Test/GGX_a02_s00.mat

     m_Floats:
     - _AlphaCutoff: 0.5
     - _AlphaCutoffEnable: 0
-    - _Anisotropy: 0
+    - _Anisotropy: 0.2
     - _BlendMode: 0
     - _BumpScale: 1
     - _CullMode: 2