Fix stb record offset

Fixes #1018

data/shaders/glsl/raytracingshadows/closesthit.rchit

@@ -68,8 +68,8 @@ void main()
 	vec3 origin = gl_WorldRayOriginEXT + gl_WorldRayDirectionEXT * gl_HitTEXT;
 	shadowed = true;  
 	// Trace shadow ray and offset indices to match shadow hit/miss shader group indices
-	traceRayEXT(topLevelAS, gl_RayFlagsTerminateOnFirstHitEXT | gl_RayFlagsOpaqueEXT | gl_RayFlagsSkipClosestHitShaderEXT, 0xFF, 1, 0, 1, origin, tmin, lightVector, tmax, 2);
+	traceRayEXT(topLevelAS, gl_RayFlagsTerminateOnFirstHitEXT | gl_RayFlagsOpaqueEXT | gl_RayFlagsSkipClosestHitShaderEXT, 0xFF, 0, 0, 1, origin, tmin, lightVector, tmax, 2);
 	if (shadowed) {
 		hitValue *= 0.3;
 	}
-}
+}