Fixed <title> in login page

Author: RigacciOrg

html/login.php

@@ -23,7 +23,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
     <meta name="description" content="">
     <meta name="author" content="Niccolo Rigacci <niccolo@rigacci.org>">
-    <title>Aerocene Exploration Tools</title>
+    <title><?= my_html($config['app_title']) ?></title>
     <!-- Bootstrap Core CSS -->
     <link rel="stylesheet" href="inc/bootstrap/css/bootstrap.min.css" type="text/css">
     <!-- Custom CSS -->