Removes the double diagram request on opening VS Code with no editor in focus #200
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During adoption to Sprotty 0.13 another way of updating the diagram was introduced that always requests a diagram when the editor is switched. When opening VS Code now with no editor in focus (e.g. when the diagram was in focus, which is not re-opened by VS Code by default), clicking on an editor triggered this newly introduced switch AND this now-removed code we had for exactly that use case. As this is now superfluous and causes duplicated requests, this removes that issue.
See #162