MB-7652: Make sure to register cursors in chks when moving them

This was accidnetally left out of my previous checkpoint cheanges

Change-Id: Ib6ded7ba88bd2589a6a243cdecbbf9bf1b7985ec
Reviewed-on: http://review.couchbase.org/24327
Reviewed-by: Chiyoung Seo <chiyoung.seo@gmail.com>
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>