editor: prevent any registration of objects on the system bus
D-Bus access-control is name-based; so requests for a specific name are allowed/denied based on the rules in /etc/dbus-1/system.d. But apparently apps still get a non-named service on the bus, and if we register *any* object even though we don't have a named service, dbus and dbus-glib will happily proxy signals. Since the connection editor shouldn't ever expose anything having to do with connections on any bus, make sure that's the case.
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