GenericLinux: Make device configuration wizard stay on top of application

Arguably, it should even stay on top of the options page if started from
there, but...

Change-Id: I36591f5f3125aad1114b799fe94b2a1dd5e03a9f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>