[examples::ssr_router] remove workaround for fixed tower issue
otherwise I was seeing
```
Missing request extension: Extension of type `alloc::string::String` was not
found. Perhaps you forgot to add it? See `axum::Extension`.
```
when navigating to localhost:8080
@@ -72,8 +72,6 @@ async fn main() {
let app = Router::new()
.route("/api/test", get(|| async move { "Hello World" }))
- // needed because https://github.com/tower-rs/tower-http/issues/262
- .route("/", get(render))
.fallback(HandleError::new(
ServeDir::new(opts.dir)
.append_index_html_on_directories(false)
