unused param removed

frontend-js/src/main/js/gui/Legend.js

@@ -74,7 +74,7 @@ Legend.prototype.hide = function () {
 };
 Legend.prototype.show = function () {
   var maxZIndex = Math.max.apply(null,
-    $.map($('body *'), function (e, n) {
+    $.map($('body *'), function (e) {
       if ($(e).css('position') !== 'static') {
         return parseInt($(e).css('z-index')) || 1;
       }