`toggle hide_after: 3000` should work without a `show_on` event

`toggle show_on: "some_event", hide_after: 3000` works as expected: After having received the "show_event" a timer is triggered and after 3000ms the content of the `toggle` is hidden again. However `toggle hide_after: 3000` is not working as expected: The content is never hidden as the timer never gets triggered. The time should get triggered on mount when specified