demos: Use queue search from spec example
demos: Use queue search from spec example

To favor finding a queue that supports both graphics and present

Change-Id: I0223b0973b4244c006ade31c6515f149f9696ff8

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