Fixes jshint warnings.

interface_config.js

     APP_NAME: "Jitsi Meet",
     INVITATION_POWERED_BY: true,
     ACTIVE_SPEAKER_AVATAR_SIZE: 100,
-    TOOLBAR_BUTTONS: ['authentication', 'microphone', 'camera', 'desktop', 'recording', 'security', 'invite',
-        'chat', 'prezi', 'etherpad', 'fullscreen', 'sip', 'dialpad', 'settings', 'hangup', 'filmstrip', 'contacts'],
+    TOOLBAR_BUTTONS: ['authentication', 'microphone', 'camera', 'desktop',
+        'recording', 'security', 'invite', 'chat', 'prezi', 'etherpad',
+        'fullscreen', 'sip', 'dialpad', 'settings', 'hangup', 'filmstrip',
+        'contacts'],
     /**
      * Whether to only show the filmstrip (and hide the toolbar).
      */

modules/UI/toolbars/ToolbarToggler.js

     UIUtil = require("../util/UIUtil");
 
 function showDesktopSharingButton() {
-    if (APP.desktopsharing.isDesktopSharingEnabled() && UIUtil.isButtonEnabled('desktop')) {
+    if (APP.desktopsharing.isDesktopSharingEnabled() &&
+        UIUtil.isButtonEnabled('desktop')) {
         $('#toolbar_button_desktopsharing').css({display: "inline-block"});
     } else {
         $('#toolbar_button_desktopsharing').css({display: "none"});

modules/UI/util/UIUtil.js

 
     hideDisabledButtons: function (mappings) {
         var selector = Object.keys(mappings)
-          .map(function (buttonName) { return UIUtil.isButtonEnabled(buttonName) ? null : mappings[buttonName]; })
+          .map(function (buttonName) {
+                return UIUtil.isButtonEnabled(buttonName)
+                    ? null : mappings[buttonName]; })
           .filter(function (item) { return item; })
           .join(',');
         $(selector).hide();