Fix #2507421 related to disabling Exchange calendars

* The bug is that we shut off sync of the adapter when a calendar is
  disabled by the user.
* Instead, we should change the sync interval to never (and set it
  back to push when the calendar is re-enabled)

Bug: 2507421
Change-Id: Ieb61e458a0372e40e402691fc4d20b1b85b3a664
1 file changed