* [misc] Fix issues of code review.

module/index/js/index.ui.js

@@ -87,7 +87,8 @@ function isOldPage(url)
  * @param {string} html
  * @returns {string}
  */
-function extractLabelText(html) {
+function extractLabelText(html)
+{
     return html.replace(/<[^>]*>/g, '').trim();
 }
 

www/js/zui3/zin.js

@@ -45,7 +45,7 @@
     const isTutorial  = top.config.currentModule === 'tutorial';
     let openedOldPage = false;
     let oldPageCofnig = null;
-    let zinCallbacks = {
+    const zinCallbacks = {
         onSelectLang: null,
         onSelectTheme: null,
         onSelectVision: null,