Pass the correct parameter to DisneyDiffuseNoPI()

ScriptableRenderPipeline/Core/ShaderLibrary/ImageBasedLighting.hlsl

 
         if (NdotL > 0.0)
         {
-            float3 H = normalize(L + V);
-            float LdotH = dot(L, H);
-            float disneyDiffuse = DisneyDiffuseNoPI(NdotV, NdotL, LdotH, RoughnessToPerceptualRoughness(roughness));
+            float LdotV = dot(L, V);
+            float disneyDiffuse = DisneyDiffuseNoPI(NdotV, NdotL, LdotV, RoughnessToPerceptualRoughness(roughness));
 
             acc.z += disneyDiffuse * weightOverPdf;
         }