fix disable log for tix api

src/index.html

@@ -13,12 +13,6 @@
     <meta name="msapplication-TileColor" content="#000000" />
     <meta name="msapplication-config" content="dist/browserconfig.xml" />
     <meta name="theme-color" content="#ffffff" />
-    <script>
-      // Give a warning if you go back in browser history.
-      window.onbeforeunload = function () {
-        return "Your work will be lost.";
-      };
-    </script>
     <!-- Google Analytics -->
     <script>
       (function (i, s, o, g, r, a, m) {