fix javascript dom selectors

lib/assets/javascripts/reporting_engine/reporting/filters.js

@@ -239,16 +239,16 @@ Reporting.Filters = {
   },
 
   value_changed: function (field) {
-    var val, tr;
+    var val, filter;
     val = $(field + '_arg_1_val');
-    tr = $('filter_' + field);
+    filter = $('filter_' + field);
     if (!val) {
       return;
     }
     if (val.value === '<<inactive>>') {
-      tr.addClassName('inactive-filter');
+      filter.addClassName('inactive-filter');
     } else {
-      tr.removeClassName('inactive-filter');
+      filter.removeClassName('inactive-filter');
     }
   },
 
@@ -294,8 +294,8 @@ Reporting.Filters = {
   },
 
   visible_filters: function () {
-    return $("filter_table").select("tr").select(function (tr) {
-      return tr.visible() === true;
+    return $("filter_table").select(".advanced-filters--filter").select(function (filter) {
+      return filter.visible() === true;
     }).collect(function (filter) {
       return filter.getAttribute("data-filter-name");
     });