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.cpp

@@ -1207,12 +1207,24 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .desc = "For Arena Model: ASIO driver name to use in place of XONAR. "
             "String should match a subkey under HKLM\\SOFTWARE\\ASIO\\\n\n"
             "Requires 7.1 @ 48kHz; if the game rejects your ASIO device, it will automatically "
-            "fall back to using WASAPI.",
+            "fall back to using WASAPI.\n\n"
+            "If the game crashes after successful ASIO init, try enabling -gdafakerealtek.",
         .type = OptionType::Text,
         .game_name = "GitaDora",
         .category = "Game Options",
         .picker = OptionPickerType::AsioDriver,
     },
+    {
+        // GitaDoraArenaFakeRealtekDevice
+        .title = "GitaDora Arena Fake Realtek Device",
+        .name = "gdafakerealtek",
+        .desc = "For Arena Model: inject a fake \"Realtek\" audio render device that discards all "
+            "audio sent to it. This is needed as the game crashes when ASIO is in use but Realtek "
+            "audio is not available. On an arcade cabinet, Realtek is used for headphone output.",
+        .type = OptionType::Bool,
+        .game_name = "GitaDora",
+        .category = "Game Options",
+    },
     {
         .title = "Force Load Jubeat Module",
         .name = "jb",