Revert "Load js-url lib using legacy-loader"

Didn't work in Firefox for some reason.

`[Script Loader] ReferenceError: module is not defined`

This reverts commit 5b83deb043.

public/js/history.js

@@ -12,16 +12,14 @@ import {
     urlpath
 } from './lib/config'
 
-var jsUrl = require('js-url')
-
 window.migrateHistoryFromTempCallback = null
 
 migrateHistoryFromTemp()
 
 function migrateHistoryFromTemp () {
-  if (jsUrl('#tempid')) {
+  if (window.url('#tempid')) {
     $.get(`${serverurl}/temp`, {
-      tempid: jsUrl('#tempid')
+      tempid: window.url('#tempid')
     })
     .done(data => {
       if (data && data.temp) {

public/js/index.js

@@ -21,8 +21,6 @@ import _ from 'lodash'
 
 import List from 'list.js'
 
-var jsUrl = require('js-url')
-
 import {
     checkLoginStateChanged,
     setloginStateChangeEvent
@@ -1476,12 +1474,12 @@ $('#gistImportModalConfirm').click(function () {
   if (!isValidURL(gisturl)) {
     showMessageModal('<i class="fa fa-github"></i> Import from Gist', 'Not a valid URL :(', '', '', false)
   } else {
-    var hostname = jsUrl('hostname', gisturl)
+    var hostname = window.url('hostname', gisturl)
     if (hostname !== 'gist.github.com') {
       showMessageModal('<i class="fa fa-github"></i> Import from Gist', 'Not a valid Gist URL :(', '', '', false)
     } else {
       ui.spinner.show()
-      $.get('https://api.github.com/gists/' + jsUrl('-1', gisturl))
+      $.get('https://api.github.com/gists/' + window.url('-1', gisturl))
                 .done(function (data) {
                   if (data.files) {
                     var contents = ''