Fix ineffective FOG variant filter

[bejado]

The FOG variant filter has no effect because UserVariantFilterBit::FOG != FOG. Thus, this has no effect:

            variant.key &= ~(filterMask & FOG);

I'm not sure why we needed to bitwise AND the filterMask with the variant bit. Maybe I'm missing something.

[github-actions]

Please add a release note line to NEW_RELEASE_NOTES.md. If this PR does not warrant a release note, add the 'internal' label to this PR.

[pixelflinger]

The FOG variant filter has no effect because UserVariantFilterBit::FOG != FOG. Thus, this has no effect:

            variant.key &= ~(filterMask & FOG);

I'm not sure why we needed to bitwise AND the filterMask with the variant bit. Maybe I'm missing something.

It was just stupid from my part. This is because I was thinking of doing something like variant.key &= ~filterMask and because the bits of the two enums don't match, I thought of "keeping" only the good ones -- but obviously this was completely wrong.

Good catch!