Added HLSL shaders for ray tracing callable sample

Minor cleanup

data/shaders/glsl/raytracingcallable/callable3.rcall

@@ -8,6 +8,4 @@ void main()
     // Generate a line pattern
 	vec2 pos = vec2(gl_LaunchIDEXT / 8);
 	outColor = vec3(mod(pos.y, 2.0));
-
-//    outColor = vec3(0.0, 0.0, 1.0);
 }

data/shaders/glsl/raytracingcallable/shadow.rmiss

@@ -1,9 +0,0 @@
-#version 460
-#extension GL_EXT_ray_tracing : require
-
-layout(location = 2) rayPayloadInEXT bool shadowed;
-
-void main()
-{
-	shadowed = false;
-}