One more test asset to tweak to use dotnet.boot.js

Author: maraf

src/Components/WebAssembly/testassets/ThreadingApp.Server/Components/App.razor

@@ -19,6 +19,7 @@
         <a class="dismiss">🗙</a>
     </div>
 
+    <script>window["__DOTNET_INTERNAL_BOOT_CONFIG_SRC"] = "dotnet.boot.js";</script>
     <script src="@Assets["_framework/blazor.web.js"]"></script>
 </body>