Update index.html

src/www/index.html

@@ -6,7 +6,7 @@
   <meta charset="utf-8"/>
   <link href="./css/app.css" rel="stylesheet">
   <link rel="manifest" href="./manifest.json">
-  <link rel="icon" href="img/favicon.ico" sizes="any">
+  <link rel="icon" href="./img/favicon.ico" sizes="any">
   <link rel="apple-touch-icon" href="./img/apple-touch-icon.png">
   <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
   <meta name="apple-mobile-web-app-capable" content="yes">