web: Improve $cockpit.dbus()
web: Improve $cockpit.dbus()

* Only put 'release' on the client once.
* Don't put the reference count on the client at all.

Closes: #516
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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