Taking a Mixed Reality Capture crashes the app

[rgerd]

It seems that even opening the MRC preview in the device portal for HoloLens 2 will crash the app.

It was due to some incorrect logic in the secondary view configuration setup that wasn't initializing swapchains because the recommended view dimensions were the same, disregarding the fact that the swapchains hadn't been initialized.

This comment was to remind us that we still needed to initialize the secondary view config swapchains when they're needed:

BabylonNative/Dependencies/xr/Source/OpenXR/XR.cpp

Lines 661 to 662 in 00ea35e

	// Create the swapchains for the primary view configuration type. Secondary view configuration type swapchains will be populated once activated.
	PopulateSwapchains(primaryRenderResource.ViewState);

But when we get to this bit, we don't see any resizing because the secondary view configurations were already initialized with the correct recommended dimensions, we just don't check if the swapchains have been initialized yet:

BabylonNative/Dependencies/xr/Source/OpenXR/XR.cpp

Lines 1477 to 1481 in 00ea35e

	if (IsRecommendedSwapchainSizeChanged(viewState.ViewConfigViews, viewConfigViews))
	{
	viewState.ViewConfigViews = std::move(viewConfigViews);
	sessionImpl.PopulateSwapchains(viewState);
	}