edbus: remove test-gui option

* was removed in:
  commit eeca5e83e550179640bdbc6f71c8b3688944ff4d
  Author: barbieri <barbieri@7cbeb6ba-43b4-40fd-8cce-4c39aea84d33>
  Date:   Fri Feb 26 23:05:02 2010 +0000

    hal: remove pointless test gui.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>