igl | Terminate GLFW after closing the window

Summary:
Call `glfwTerminate()` after closing the window.

No need to call `glfwDestroyWindow()` explicitly as it is a part of `unique_ptr`.

Reviewed By: dmannemela

Differential Revision: D51318546

fbshipit-source-id: dd6f40e82a78fd6527633176c8192f960cefcc0e

shell/windows/vulkan/App.cpp

@@ -206,15 +206,15 @@ int main(int argc, char* argv[]) {
     glfwPollEvents();
   }
 
-  glfwDestroyWindow(vulkanWindow.get());
-  glfwTerminate();
-
   // Explicitly destroy all objects before exiting in order to make sure that
   // whatever else global destructors may there, will be called after these. One
   // example is a graphics resource tracker in the client code, which otherwise
   // would not be guaranteed to be called after the graphics resources release.
   vulkanShellPlatform_ = nullptr;
   vulkanSession_ = nullptr;
+  vulkanWindow = nullptr;
+
+  glfwTerminate();
 
   return 0;
 }