MB-49635 Add 'margin-bottom-2' class to client certificate row

Viewing the certificates page at a smaller screen size, so
that the layout becomes a column, will no longer hide the
+/- buttons behind the footer.

Change-Id: I62fe838696d43db8c310aeaa52036e1c0996182e
Reviewed-on: https://review.couchbase.org/c/ns_server/+/165997
Tested-by: Matthew Dawber <[email protected]>
Well-Formed: Build Bot <[email protected]>
Reviewed-by: Pavel Blagodov <[email protected]>

Author: Matthew Dawber

priv/public/ui/app/mn_admin/mn_certificates.html

@@ -167,7 +167,7 @@ <h5>
         </div>
       </div>
 
-      <div class="row flex-right fix-width-5 resp-sml margin-top-half">
+      <div class="row flex-right fix-width-5 resp-sml margin-top-half margin-bottom-2">
         <button
            class="outline btn-small"
            title="Add a prefix"