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Fix calculation for CABAC zero words.

Karl Sharman requested to merge (removed):fix_cabac_zero_words into master

Corrects CABAC zero word calculation.

For 10 bit 4:2:0 processing, the calculation would have been: 2*(10>>2) = 4 whereas it should have been int((2*10) >> 2) = 5

Will slightly impact (improve) CTCs, especially at low QPs.

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