AUDIO: FluidSynth: If audio preferred device is set to default, it auto sets to FluidSynth in next startup

[LukasThyWalls]

Hello.

I have noticed in ScummVM 2.5.1 (Flatpak package) in KUbuntu 21.10 (Kernel 5.14.0), when i set the Preferred audio device to "Default" in global settings, when i restart ScummVM, it automatically changes it to "FluidSynth". I saw when i change it to "Default" in the GUI and i Apply, is changed in ScummVM.ini (music_driver = auto), but when ScummVM starts, it reverts the setting to FluidSynth (music_driver = fluidsynth). It doesn't seems to do this with other setting, for sure not if i pick other setting of the Preferred Audio Device (music_driver), as it keeps it.

The main issue with this is if you are using the MT-32 emulator, it overrides it if you left the FluidSynth audio device setting on. Sure, you can set the game itself to override the audio settings and use the default or MT-32 emulator as audio device, but, in this port if you change the setting or in other ports by default, if you have configured globally the MT-32 settings and put the globally audio as default, you don't need to override anything, it simply works.

Thanks.