Updated shaping algorithm

-- bitrate > 2x floor => no changes
        so 1st party camera (with high bitrates) is unchanged
-- if QP desired, but not supported by codec -> +20% bitrate
        try to compensate for missing QP capabilities

Bug: 183211971
Test: video quality tests
Change-Id: Ibdff3c6d73af6372f265ccb945066272ac4097d9