message: Disable framework overlay for explicit ImGui sample
  Fixes
diff: @@ -499,6 +499,8 @@ public:
  camera.setPosition(glm::vec3(0.0f, 0.0f, -4.8f));
  camera.setRotation(glm::vec3(4.5f, -380.0f, 0.0f));
  camera.setPerspective(45.0f, (float)width / (float)height, 0.1f, 256.0f);
  + // Don't use the ImGui overlay of the base framework in this sample
  + settings.overlay = false;
  }
  ~VulkanExample()
  