SystemUI: Open Quick Settings panel if there are no active notifications

This is ported from AOKP and described as follows:

  If there are no notifications that belong to the current user, then automatically
  open the quick settings menu (like the two-finger open). It only ignores the ADB
  icon for now (which is pretty useless) but could be extended to ignore the usb
  mounting one or maybe another?
  Author: Roman Birg <romanbirg@gmail.com> AOKP
  AOKP Github: commit 2eb664a4bc5f93b705eeeaa0847331343bb017cd

The CM version of the commit respects the Power widget enabled settings and will
only display this behaviour if the Power widget is disabled.

Change-Id: Ie0c22167ebc6fd3152335c4148dbb7c65bfce46f
SystemUI: Tweak number of notifications detection method

Change-Id: Ibd46fa5039e1d3062dcdb8f3c4dbd9ec1bdc73b0