fix a warning about outdated meta tag (#47915)

resources/frontend_client/index_template.html

@@ -5,7 +5,7 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
     <meta name="robots" content="noindex" />
-    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
     <link rel="apple-touch-icon" sizes="180x180" href="app/assets/img/apple-touch-icon.png">
     <link rel="icon" href="{{{favicon}}}" />