Don't send a dummy 0 HID event when connection is closed

This was put there by Broadcom to try to handle held keys
on disconnect, but the best place to do that is in InputManager.
There's no guarantee that a report_id 1 is keyboard, and
in particular it causes game controllers to get a false
joystick move event to 0,0.

Bug 12785130

Change-Id: I85fbafa44d927082def3848132344550e8b94bb0
Signed-off-by: Mike J. Chen <mjchen@google.com>