fix #308469: changing portaudio preferences does not work (3.x) #6523
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Resolves: https://musescore.org/en/node/308469
3.x version of: #6423
PortAudio does not work perfectly on my machine (options are missing), but I don't think that has to do with the preferences. The problem was that the preferences related to it were not added to the new system. I added them and fixed some bugs with combo boxes.