ivi-shell: remove add_configured_listener left-over

In all my rebases, this got accidentally left behind. The implementation
was removed in 4a7503976b5d300a4474b149d877cf579c2a8c05 but
32ca791df8f855898e007512f3b996a66ffcb09c reintroduced it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed