Clean up DND slice in search.

- Remove the controller in SoundSettings, just use the common one.
- Update a bunch of IDs so ZenModeSliceBuilder maps to the toggle
  button in zen_mode_settings.xml

This is needed so the slice intent (left target when shown in search)
is the same as what we index from search side. Previously the search
indexer is finding zen_mode from sound page but the slice itself is
reporting a deep link into zenModeSettings page.

Fixes: 130437726
Test: robotest

Change-Id: Ic41d2d93afa1f748e3282e23010199a0fa078645