style(rust): Format all Rust code with rustfmt

Change-Id: Iab7e00cc26a4f9727d3ab98691ef379921a33052
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5240
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>

web/atward/build.rs

@@ -28,14 +28,19 @@ fn main() {
 
     // Otherwise ask Nix to build it and inject the result.
     let output = Command::new("nix-build")
-        .arg("-A").arg("web.atward.indexHtml")
+        .arg("-A")
+        .arg("web.atward.indexHtml")
         // ... assuming atward is at //web/atward ...
         .arg("../..")
         .output()
         .expect(ERROR_MESSAGE);
 
     if !output.status.success() {
-        eprintln!("{}\nNix output: {}", ERROR_MESSAGE, String::from_utf8_lossy(&output.stderr));
+        eprintln!(
+            "{}\nNix output: {}",
+            ERROR_MESSAGE,
+            String::from_utf8_lossy(&output.stderr)
+        );
         return;
     }