Ray tracing samples can now also use the UI overlay

General cleanup, changed default settings.overlay value

examples/computenbody/computenbody.cpp

@@ -82,7 +82,6 @@ public:
 	VulkanExample() : VulkanExampleBase(ENABLE_VALIDATION)
 	{
 		title = "Compute shader N-body system";
-		settings.overlay = true;
 		camera.type = Camera::CameraType::lookat;
 		camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 512.0f);
 		camera.setRotation(glm::vec3(-26.0f, 75.0f, 0.0f));