Remove random + 0.5

Assets/ScriptableRenderLoop/ShaderLibrary/ImageBasedLighting.hlsl

 
     for (uint i = 0; i < sampleCount; ++i)
     {
-        float2 u    = Hammersley2d(i, sampleCount);
-        u           = frac(u + randNum + 0.5);
+        float2 u = frac(randNum + Hammersley2d(i, sampleCount));
 
         float VdotH;
         float NdotL;