Fix point light assignment

[FlexW]

Thank you for writing the book. I enjoyed it a lot. I think I spotted two mistakes. There might be other places in the codebase that have the same issues:

The min and max light id calculation needs to include lights that have their projected z coordinates smaller and greater than then bin z bounds.

I think it may be also needed to include this condition before checking the point lights projected z min/max to skip lights that are behind the camera.

if (sortedLight->projected_z_min < 0.0f && sortedLight->projected_z_max < 0.0f)
{
    // The light is behind the camera, skip it
    continue;
}

The address calculation of tiles need the x value multiplied by the words count. Otherwise the address is not correct because one tile covers words count unsigned integers.

[theWatchmen]

Thanks for the PR and apologies for the late reply, I was away on holiday :) I'll review the changes in the next few days.

[theWatchmen]

Not sure this is correct, as this would include lights that have their min/max depth bounds outside the bin bounds. It could well be that this line is not needed though and that we just need to check the min/max z against the bin bounds. I haven't run the code yet, I'll verify more thoroughly later.