cubepp: Copy cubes swapchain format selection
cubepp: Copy cubes swapchain format selection

The differing logic led to vkcube choosing a different swapchain image format
to vkcubepp.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools