systemd-lock-handler: fix DBus policy failage
systemd-lock-handler: fix DBus policy failage

Okay, apparently dbus.py doesn't actually introspect; it just sends the
method call to a null interface, which works but the policy doesn't
allow.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks