bug on modules page, select content js

this broke way back when we did the base_ar_class
stuff, but nobody noticed until now, because
so few people actually have bookmark services
registered.

Change-Id: I6c264de3e982df36690803c149fac145e7d690f8
Reviewed-on: https://gerrit.instructure.com/2216
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>

public/javascripts/select_content_dialog.js

@@ -36,7 +36,7 @@ $(document).ready(function() {
       var $services = $("#content_tag_services").empty();
       $.getUserServices('BookmarkService', function(data) {
         for(var idx in data) {
-          service = data[idx].bookmark_service;
+          service = data[idx].user_service;
           $service = $("<a href='#' class='bookmark_service no-hover'/>");
           $service.addClass(service.service);
           $service.data('service', service);