Apply bit cost fixes to edge band band sao search.
Apply bit cost fixes to edge band band sao search.

- Increases bdrate slightly. It's still a cleaner solution though and further
  improvements to bit cost estimation might improve things.

lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar