GoogleVR layout visible if stereo is off on iOS

User reported bug

With iOS applications that swap from VR mode to non-stereoscopic mode, GoogleVR overlay remains on screen.

This does not occur on Android devices.

1- Create a new C++ project on a mac
2- Enable Google VR plugin
3- Restart project
4- Disable google VR using blueprint (Enable HMD -> False)
5- Launch on iOS device (Tested on iphone 5s) (You may need to orient the screen an unintuitive way to get past "place phone in viewer" screen)
6- Observe that GoogleVR overlay (White line, Cog Icon) is still visible