Fix a couple of small errors in ray tracing examples

nv_ray_tracing_basic.cpp
 - update to 3 component vertex data (4 component isn't supported)
 - update type to TOP_LEVEL when building the TLAS

nv_ray_tracing_reflections.cpp
 - update AS info type to TOP_LEVEL when building the TLAS

nv_ray_tracing_shadows.cpp
 - update AS info type to TOP_LEVEL when building the TLAS

Validation layer changes coming soon :)

examples/nv_ray_tracing_reflections/nv_ray_tracing_reflections.cpp

@@ -374,6 +374,7 @@ public:
 		/*
 			Build top-level acceleration structure
 		*/
+		buildInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_NV;
 		buildInfo.pGeometries = 0;
 		buildInfo.geometryCount = 0;
 		buildInfo.instanceCount = 1;