demos: Put smoketest exe in same dir as cube and tri
demos: Put smoketest exe in same dir as cube and tri

Change-Id: I35dec36d3e67912375180192e1ca8ed1fa2abe75

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