Fix corrupted luma from biased subtract in the x86 residue blocks - #138
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The 8-bit SSE and AVX-512 residue blocks subtracted the limited-range luma bias with a signed saturating subtract (
_mm_subs_epi8/_mm512_subs_epi8) while the vector loop used the unsigned one. WithYuvRange::Limited(bias 16) that corrupts luma below the bias and luma in 128..144.