[Partial Fixed] Win Audio bitrate selection is buggy

[auf_krawall_gebürstet]

Hello,
minor bug: High bitrates can't be selected if no track is added yet:


After the track is added and I change the mixdown option to something different and then back to 6 Channel Discrete, then higher bitrates are available:

(The change from normal to high profile on the screenshots was accidently done but doesn't mean anything.)

Happens with dev builds but not with the latest final.

[s55]

https://trac.handbrake.fr/changeset/4226 This should mitigate the issue a bit by refreshing the mixdown/bitrate dropdowns when you add a track.

I'm not going to fix this properly until I get around to building an in-line control based grid of audio controls (like the macgui). It requires a pretty narly code hack with the current implementation.