VR Splash screen and Async Load issue

We encountered this problem too after upgrading to 4.15. It's caused by a timing problem when showing/hiding the async loading splash screen, so we only found it when loading maps in standalone that included streamed sublevels.

FAsyncLoadingSplash::OnLoadingBegins() tells Oculus to show it's splash screen (black screen), then bAutoShow is set to false in FHeadMountedDisplay::UpdateSplashScreen(), meaning that when FAsyncLoadingSplash::OnLoadingEnds() is called, it skips hiding the splash screen again.

You can work around this by adding an extra check to OnLoadingEnds():

if (bAutoShow || LoadingStarted)

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