cube sample: Removed unused layout binding.
cube sample: Removed unused layout binding.

gardell/vulkan-cpp-library,aonorin/vulkan-cpp-library,google/vulkan-cpp-library,aonorin/vulkan-cpp-library,google/vulkan-cpp-library,google/vulkan-cpp-library,aonorin/vulkan-cpp-library,gardell/vulkan-cpp-library