Pass the latest active key to the Block's scan function

Effectively necessary for networks on which we utilize account abstraction in
order to know what key to associate the received coins with.

networks/ethereum/relayer/src/main.rs

@@ -91,7 +91,8 @@ async fn main() {
         let Ok(_) = socket.read_exact(&mut buf).await else { break };
 
         let transaction = db.get(&buf[.. 4]).unwrap_or(vec![]);
-        let Ok(()) = socket.write_all(&u32::try_from(transaction.len()).unwrap().to_le_bytes()).await
+        let Ok(()) =
+          socket.write_all(&u32::try_from(transaction.len()).unwrap().to_le_bytes()).await
         else {
           break;
         };