dsound: Use a better FIR filter generated with the Parks-McClellan algorithm.

The new filter provides a 108.9 dB stopband rejection and doesn't attenuate frequencies below 19 kHz (assuming 44.1 kHz sampling rate).

magnitude.pm-fir19

sweep.wine.upstream

sweep.wine.pm-fir19

P.S.: Thanks to Matteo Bruni for providing the test tools.

Edited by Anton Baskanov

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