Alt + F11 now disables fullscreen both when the "don't show again" popup
is up, and also when a browser had focus.
The popup dialog now closes when the follscreen method is disabled via
Alt+F11 shortcut
The dialog message tells to use the Toggle Full Screen command or
Alt+F11 to deactivate

Change-Id: I8682710f009900576f048263e12f53207089c3fc
Signed-off-by: Patrik Suzzi <psuzzi@gmail.com>