defs: remove DISTORTION_PRECISION_ADJUSTMENT, fix bug in 2e22ea6ec4bc

FULL_NBIT was disabling this macro for even 16bpp builds, but I accidentally
enabled it. Since it was previously disabled for every build, and is only even
present in SAO and quant, it is best to just remove it completely.
param: disable range checks for psy-rdoq while we tune it