Do not track DreamOverlayStatusBarView for touch.

The dream overlay status bar no longer needs to handle touches
(a touch handler now handles dragging down the notification
shade). This changelist removes touch interception on this view
to allow touches to pass down to the dream.

Fixes: 273540283
Test: manual - tap recovery button from status bar area.
Change-Id: I4551fbc76e083d4214a7b4a83c25ba1f4e077d7a