Bug 29215: (bug 3137 follow-up) Fix guarantor block toggle

The guarantor template must be kept hidden, always.

Test plan:

Edit a patron with a guarantor, click the legend of the "patron
guarantor" block and confirm that the template is not shown

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/en/modules/members/memberentrygen.tt

@@ -1644,6 +1644,7 @@ legend:hover {
             $("legend").click(function(){
                 $(this).nextAll().toggle();
                 $("#messaging_prefs_loading").hide();
+                $("#guarantor_template").hide();
             });
 
             $("#saverecord").css({ 'margin-left': 0 });