Fix bug in intra mode rd penalty.
The intra mode rd penalty was implemented as a rate penalty. Code was added to scale the penalty according to block size but this was not done correctly for the SB level or sub 8x8. The code did a weird double scaling in regard to bit depth that has been removed. Given that it is a rate penalty the bit depth should not matter. This bug fix improves average metrics on our standard test sets by about 0.1% Change-Id: I7cf81b66aad0cda389fe234f47beba01c7493b1e
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