Bug 24337: Checkout note cannot be marked seen if more than 20 exist

This patch modifies the event handler on the individual "Mark seen" /
"Mark unseen" buttons in the table of checkout notes. For an event to be
successfully attached to a hidden element it must be given a context.

To test you should have multiple checkout notes to work with, both seen
and unseen. Apply the patch and go to "Checkout notes pending" from the
staff client home page.

 - Navigate to the second "page" of data in the DataTable.
 - Test the functionality of the "Mark seen" and "Mark unseen" buttons.
   They should work correctly.

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

koha-tmpl/intranet-tmpl/prog/en/modules/circ/checkout-notes.tt

@@ -166,7 +166,7 @@
                 }
             });
 
-            $("button.seen, button.notseen").click(function(event){
+            $("#notestable").on("click", "button.seen, button.notseen", function(event){
                 event.preventDefault(); // prevent form submission
                 var $action = $(this).attr("name");
                 var $issue_id = $(this).data('issue_id');