Can't change audio_device from GUI

[eumagga0x2a]

STR:

• In Avidemux: Edit --> Preferences --> Audio --> select another AudioDevice (on Linux e.g. from "PulseAudioS" to "AlsaDefault") --> OK
• Reopen Preferences --> Audio

Actual Results:
The old AudioDevice is selected, no changes have been made to ~/.avidemux/config3 file in the audio_device section.

This is a recent regression. Currently the only way to change audio output device is directly editing config3.

[mean]

Should be okay now

[eumagga0x2a]

Confirmed fixed by [audioDevice] Fix string vs std::string, similar to the recent language selection fix. Thanks!