RecentModel: keep selection when nodes are replaced

In the case we replace a ContactMethod node by a Person node, we
need to make sure that the selection is updated. This is especially
important during an incoming Call.

Change-Id: I9bf78b7d359b7d01cc55b50178a13d703a72d6ba
Reviewed-by: Nicolas Jäger <nicolas.jager@savoirfairelinux.com>