The TestNoScreenMenuBar test should be updated

This test tried to run an external application to make itself non-active and then sets and checks the global menu.

But it has a few issues:
 - As an external app, the "System Settings" app is used, but it looks like in macOS Catalina this app was moved, and nothing actually starts
 - The external app is closed via osascript which required special permission, and it is requested via a modal dialog if not granted already
 - It looks like the attempt to close(already closed) the "System Settings" via osascript actually activate it instead

It is better to use something else as an external app.