cube: Set pipeline renderpass
cube: Set pipeline renderpass

LunarXchange issue #111:
https://vulkan.lunarg.com/app/issues/55cbc6d77ef24d0001000001
noticed that the pipeline's renaderPass was not being set.

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