[Status Bar Refactor] Move PanelBar's touch handling into

NotificationPanelViewController.

All the code should be exactly the same, it's just
happening in a different place.

Bug: 202981994
Bug: 200063118
Test: Manual: Can still interact with status bar and notification shade
in all the typical ways
Test: atest NotificationPanelViewControllerTest,
PhoneStatusBarViewControllerTest, PhoneStatusBarViewTest, StatusBarTest

Change-Id: Id882cff69d4670dd1ac89264c689e63d15240287