Silent some warning

com.unity.render-pipelines.high-definition/HDRP/Lighting/Volumetrics/VolumetricLighting.compute

 
     // TODO
     LightLoopContext context;
+    context.sampleReflection = 0;
+    context.contactShadow = 1.0;
     uint featureFlags = 0xFFFFFFFF;
 
     PositionInputs posInput = GetPositionInput(voxelCoord, _VBufferResolution.zw, tileCoord);