fixed typo in app title met tag

index.html

@@ -5,7 +5,7 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="theme-color" content="#3D3D3D" />
-    <meta name="appTitle" content="print PWA logos!" />
+    <meta name="app-title" content="print PWA logos!" />
     <link rel="manifest" href="manifest.json">
     <link href="styles/pwinter_light.css" type="text/css" rel="stylesheet" media="(prefers-color-scheme: light)">
     <link href="styles/pwinter_dark.css" type="text/css" rel="stylesheet" media="(prefers-color-scheme: dark)">