Increases the bias against using the H/V predictor
Increases the bias against using the H/V predictor

This both increases the RDO cost of using H/V pred, and ensures we always
consider the noref case for luma on keyframes.

subset1:
           RATE (%) DSNR (dB)
    PSNR -1.07961 0.0521861
 PSNRHVS -1.15119 0.0729193
    SSIM -0.830752 0.0349988
FASTSSIM -0.512928 0.0161848

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