style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

pezkuwi/node/network/dispute-distribution/src/sender/send_task.rs

@@ -315,8 +315,9 @@ async fn wait_response_task<M: 'static + Send + Sync>(
 	let result = pending_response.await;
 	let msg = match result {
 		Err(err) => TaskFinish { candidate_hash, receiver, result: TaskResult::Failed(err) },
-		Ok(DisputeResponse::Confirmed) =>
-			TaskFinish { candidate_hash, receiver, result: TaskResult::Succeeded },
+		Ok(DisputeResponse::Confirmed) => {
+			TaskFinish { candidate_hash, receiver, result: TaskResult::Succeeded }
+		},
 	};
 	if let Err(err) = tx.send_message(msg).await {
 		gum::debug!(