Deleted events in calendar still show in indicator.

* Add some events to the current day using the indicator to open calendar.
* Close the calendar and confirm events shown in popup.
* Reopen the calendar and delete the events by editing them and pressing the Delete Event button.
* Close the calendar and look at the popup. The events are still there. However, if they are clicked on to open the calendar, they are not in the calendar.

Restarting wingpanel causes the events to disappear from the popup.

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