Mass replace ,); pattern (#3580)

This is an artifact left by rustfmt which is not dare to remove the
comma being conservative.

polkadot/node/core/pvf/src/execute/queue.rs

@@ -258,7 +258,7 @@ async fn spawn_worker_task(program_path: PathBuf, spawn_timeout: Duration) -> Qu
 		match super::worker::spawn(&program_path, spawn_timeout).await {
 			Ok((idle, handle)) => break QueueEvent::Spawn((idle, handle)),
 			Err(err) => {
-				tracing::warn!(target: LOG_TARGET, "failed to spawn an execute worker: {:?}", err,);
+				tracing::warn!(target: LOG_TARGET, "failed to spawn an execute worker: {:?}", err);
 
 				// Assume that the failure intermittent and retry after a delay.
 				Delay::new(Duration::from_secs(3)).await;