Bug 29616: (QA follow-up) Use /public endpoints on OPAC

This patch updates the new modal to use the /public version of the
libraries endpoint for fetching library data. This ensure the feature
works as expected prior to patron login.

koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt

@@ -1934,7 +1934,7 @@
                 var branchcode = $(this).data("branchcode");
                 var url = $(this).attr("href");
                 $.ajax({
-                    url: "/api/v1/libraries/" + branchcode,
+                    url: "/api/v1/public/libraries/" + branchcode,
                     type: 'GET',
                     dataType: 'json',
                     success: function(result) {