[VisionGlass] Do not draw the environment (skybox)

We could completely prevent the environment from rendering by enabling
passthrough at startup in the settings. We do the same for other
see-through devices like the Lenovo A3. This is not a "real"
passthrough as we aren't showing the real world by getting a video
stream from a camera. That's because we don't need it as the device
is not fully immersive but rather an AR device.

Current Wolvic's code defaults to not rendering the skybox if
passthrough is enabled and there is no passthrough layer.

app/src/common/shared/com/igalia/wolvic/browser/SettingsStore.java

@@ -325,7 +325,7 @@ public void setSystemRootCAEnabled(boolean isEnabled) {
     }
 
     public static boolean shouldStartWithPassthrougEnabled() {
-        return DeviceType.getType() == DeviceType.LenovoA3;
+        return DeviceType.getType() == DeviceType.LenovoA3 || DeviceType.getType() == DeviceType.VisionGlass;
     }
 
     public boolean isStartWithPassthroughEnabled() {