Minor alarm in-place editing tweaks.
Minor alarm in-place editing tweaks.

- Toggle off repeat removes all repeat state from underlying alarm in addition
  to hiding the visual display.
- Changing time turns alarm on automatically.

Bug: 7289559
Change-Id: Ifbc4d1c7d994ec93717e2fd5b9267c9740ca1e82

dseuss/deskclock,OrBin/SynClock-Android,dseuss/deskclock