Optimize [BLAZOR][WASM] project template for PWA applications. (dotnet#33498)

* Add `192x192` icon to PWA Project template.
* Add `PWA` flag to [BLAZOR][WASM] project template.

Author: taha-ghadirian

src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/.template.config/template.json

@@ -4,7 +4,8 @@
   "classifications": [
     "Web",
     "Blazor",
-    "WebAssembly"
+    "WebAssembly",
+    "PWA"
   ],
   "name": "Blazor WebAssembly App",
   "defaultName": "BlazorApp",

src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/index.html

@@ -16,6 +16,7 @@
     <!--#if PWA -->
     <link href="manifest.json" rel="manifest" />
     <link rel="apple-touch-icon" sizes="512x512" href="icon-512.png" />
+    <link rel="apple-touch-icon" sizes="192x192" href="icon-192.png" />
     <!--#endif -->
 </head>