Launcher : Make settings launch/dismiss overview mode

Aosp has the settings icon no-op'd since in the google edition,
it maps to google now search settings. This makes it so it maps to
the settings application.

Change-Id: I5a70705f2e7fde75511868fb351436f072dfabfb
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>