layers: Fix ObjectTracker to not flag error when PhysicalDevice not deleted b/c it can't be deleted.
layers: Fix ObjectTracker to not flag error when PhysicalDevice not deleted b/c it can't be deleted.

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