auto-t: iwd.py: use args[0] for station debug interface

Passing *args, **kwargs into StationDebug ended up initializing the
class with Station properties since devices can be initialized from
existing property dictionaries. Since the object path is all
StationDebug needs, pass args[0] instead.

autotests/util/iwd.py

@@ -287,7 +287,7 @@ class Device(IWDDBusAbstract):
 
         IWDDBusAbstract.__init__(self, *args, **kwargs)
 
-        self._station_debug = StationDebug(*args, **kwargs)
+        self._station_debug = StationDebug(args[0])
 
     @property
     def _wps_manager(self):