Use the mode0 fast-pash less for -fastest quality
Use the mode0 fast-pash less for -fastest quality

- For 6x6 this improves IQ by around 0.3dB for ~8% performance.
- For 8x8 this improves IQ by around 0.5dB for ~15% performance.

Both are still substantially faster than -fast (2-3x).

ARM-software/astc-encoder,ARM-software/astc-encoder,ARM-software/astc-encoder,ARM-software/astc-encoder