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postDelayed calls to stop the calendars list from being refreshed were
surviving the activity being finished and re created. This explicitly
turns them off and on when the activity calls onPause and onResume
respectively. This also rearranges where the refresh post gets set up
to make it more dependable.

Change-Id: Icdc1c0ee4e6dad91fb1792748d1a43df8e2ad6c2