Revert "Don't dismiss adb authorization prompt upon USB disconnect."

This reverts commit e34087b1.

Reason for revert: Restoring UsbDisconnectedReceiver to allow dialog
in the background to be closed and redisplayed in the foreground by
reseating the usb cable.

Bug: 156323450
Test: Removed usb cable, verified dialog was closed
Change-Id: I84a636ba3c9f7e35beb0769ae80aa6c6df0c2f2c