Fix default resampling quality selection

[farshield]

When the user doesn't explicitly specify the resampling quality using the -Q flag, the quality should be calculated based on Jack's server sampling rate.

This isn't the case, because the rqual variable is always set to 16 in jack_initialize. This results in the quality always being 16.

To fix this and make the behavior the same as the zita-ajbridge tools, the redundant rqual clamping of the value to the range [16,96] should be removed from jack_initialize(), because this is done later in jack_initialize_part2() only AFTER the quality calculation.