Update BlazorServerApp Sample Project (#36684)

Updated `Blazor.start` to match documented structure:

https://docs.microsoft.com/en-us/aspnet/core/blazor/fundamentals/startup?view=aspnetcore-6.0#chain-to-the-promise-that-results-from-a-manual-start

Author: TanayParikh

src/Components/Samples/BlazorServerApp/Pages/_Layout.cshtml

@@ -17,12 +17,10 @@
 
     <script src="_framework/blazor.server.js" autostart="false"></script>
     <script>
-        (function start() {
-            Blazor.start({
-                logLevel: 1, // LogLevel.Debug
-                configureSignalR: builder => builder.configureLogging("debug") // LogLevel.Debug
-            });
-        })()
+        Blazor.start({
+            logLevel: 1, // LogLevel.Debug
+            configureSignalR: builder => builder.configureLogging("debug") // LogLevel.Debug
+        });
     </script>
 </body>
 </html>