tj3Set(): Allow TJPARAM_LOSSLESSPT vals from 0..15 The target data precision isn't necessarily known at the time that the calling program sets TJPARAM_LOSSLESSPT, so tj3Set() needs to allow all possible values (from 0 to 15.) jpeg_enable_lossless(), which is called within the body of tj3Compress*(), will throw an error if the point transform value is greater than {data precision} - 1.