gitadora: (arena model) simulate Realtek device, fix asio redirect hooks (#732)

## Link to GitHub Issue or related Pull Request, if one exists
#730, #718

## Description of change

Part 1)

When ASIO is in use, the game also looks for a Realtek device so that it
can open a WASAPI Exclusive mode stream for headphones.

Add an option to fake that, in case the user doesn't have a Realtek
device.

Part 2)

`-gdaasio` wasn't workign properly - fix the logic.

## Testing
Seems to work with FlexASIO, and Xonar with no real Realtek device.

src/spice2x/launcher/options.h

@@ -117,6 +117,7 @@ namespace launcher {
             GitaDoraArenaSingleWindow,
             GitaDoraArenaWindowLayout,
             GitaDoraArenaAsioDriver,
+            GitaDoraArenaFakeRealtekDevice,
             LoadJubeatModule,
             LoadReflecBeatModule,
             LoadShogikaiModule,