HDRenderPipeline: fix issue in a graphic test about metapass

Tests/GraphicsTests/RenderPipeline/HDRenderPipeline/Scenes/2xxx_Lighting/2101_GI_Metapass/Lit_Mirror_Specular.mat

     - _EnableMotionVectorForVertexAnimation: 0
     - _EnableSpecularOcclusion: 0
     - _EnableWind: 0
+    - _EnergyConservingSpecularColor: 1
     - _HeightAmplitude: 0.02
     - _HeightCenter: 0.5
     - _HeightMapParametrization: 1
     - _ZTestMode: 4
     - _ZWrite: 1
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
-    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _BaseColor: {r: 0, g: 0, b: 0, a: 1}
+    - _Color: {r: 0, g: 0, b: 0, a: 1}
     - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
     - _EmissionColor: {r: 1, g: 1, b: 1, a: 1}
     - _EmissiveColor: {r: 1, g: 1, b: 1, a: 1}