When CLPF was extended to chroma, the chroma RDO accidentally
discarded the optimal block size found in the luma RDO.

PSNR YCbCr:     -0.25%      0.05%      0.06%
   PSNRHVS:     -0.19%
      SSIM:     -0.36%
    MSSSIM:     -0.23%

Change-Id: Idf9f4a18ad774d7b4ff8e907df0180225ea0ccaf