MB-12355: unified placement of edit/delete buttons on xdcr section

It is now same as with views. Left-to-right it's Edit then Delete.

Change-Id: I1e108d3806667bce908b7eff14e41deb859c392b
Reviewed-on: http://review.couchbase.org/42207
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>