Pass the correct parameter to DisneyDiffuse()

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitReference.hlsl

 
         if (NdotL > 0.0)
         {
-            float3 H = normalize(L + V);
-            float LdotH = dot(L, H);
+            float LdotV = dot(L, V);
-            float disneyDiffuse = DisneyDiffuse(NdotV, NdotL, LdotH, bsdfData.perceptualRoughness);
+            float disneyDiffuse = DisneyDiffuse(NdotV, NdotL, LdotV, bsdfData.perceptualRoughness);
 
             // diffuse Albedo is apply here as describe in ImportanceSampleLambert function
             float4 val = SampleEnv(lightLoopContext, lightData.envIndex, L, 0);