demos: fix cubepp on wayland errors
demos: fix cubepp on wayland errors

Change-Id: I74fe07d170ee0e403357a018554ac9d6c754b6b5

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers