aq, cutree: preset changes

1. Disable AQ at ultrafast/superfast presets
2. Disable CUTree at ultrafast/superfast/veryfast/faster presets (requires b-adapt to be non-zero).
3. tune-psnr disables only AQ, CUtree stays enabled (at appropriate presets).
aq, cutree: completely turn of AQ, at fastest presets

Prevent AQ from running unnecessarily with strength 0.