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/launcher.cpp

@@ -687,6 +687,9 @@ int main_implementation(int argc, char *argv[]) {
     if (options[launcher::Options::GitaDoraArenaAsioDriver].is_active()) {
         games::gitadora::ASIO_DRIVER = options[launcher::Options::GitaDoraArenaAsioDriver].value_text();
     }
+    if (options[launcher::Options::GitaDoraArenaFakeRealtekDevice].value_bool()) {
+        hooks::audio::FAKE_REALTEK_RENDER_DEVICE = true;
+    }
     if (options[launcher::Options::LoadNostalgiaModule].value_bool()) {
         attach_nostalgia = true;
     }