Revert "Further optimize coefficient coding"
Revert "Further optimize coefficient coding"

This reverts commit 25462124f8933f32eedff2a5d9cf8ba078b1411b.

That commit broke the bitstream. If it's not good enough to push on Friday
night, it's probably not good enough on Monday morning either.

ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar