Navbar: add spacer to lightsout layout

This will align the lightsout buttons with the normal ones.

Change-Id: I9a3008ae8f16f35efc595d2a2f1d07a3eef47c29
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Originally Authored by : MarcLandis