Updated to comply with new clippy formatting rules (#2336)

## Issue Addressed

The latest version of Rust has new clippy rules & the codebase isn't up to date with them.

## Proposed Changes

Small formatting changes that clippy tells me are functionally equivalent

beacon_node/eth2_libp2p/src/discovery/enr_ext.rs

@@ -299,7 +299,7 @@ mod tests {
         let sk_bytes = hex::decode(sk_hex).unwrap();
         let secret = discv5::enr::ed25519_dalek::SecretKey::from_bytes(&sk_bytes).unwrap();
         let public = discv5::enr::ed25519_dalek::PublicKey::from(&secret);
-        let keypair = discv5::enr::ed25519_dalek::Keypair { public, secret };
+        let keypair = discv5::enr::ed25519_dalek::Keypair { secret, public };
 
         let libp2p_sk = libp2p::identity::ed25519::SecretKey::from_bytes(sk_bytes).unwrap();
         let ed25519_kp: libp2p::identity::ed25519::Keypair = libp2p_sk.into();

beacon_node/eth2_libp2p/src/service.rs

@@ -233,9 +233,9 @@ impl<TSpec: EthSpec> Service<TSpec> {
         }
 
         let service = Service {
-            local_peer_id,
-            bandwidth,
             swarm,
+            bandwidth,
+            local_peer_id,
             log,
         };
 

beacon_node/eth2_libp2p/src/types/topics.rs

@@ -81,8 +81,8 @@ impl GossipTopic {
     pub fn new(kind: GossipKind, encoding: GossipEncoding, fork_digest: [u8; 4]) -> Self {
         GossipTopic {
             encoding,
-            kind,
             fork_digest,
+            kind,
         }
     }
 
@@ -135,8 +135,8 @@ impl GossipTopic {
 
             return Ok(GossipTopic {
                 encoding,
-                kind,
                 fork_digest,
+                kind,
             });
         }
 
@@ -195,7 +195,10 @@ pub fn subnet_id_from_topic_hash(topic_hash: &TopicHash) -> Option<SubnetId> {
 fn committee_topic_index(topic: &str) -> Option<SubnetId> {
     if topic.starts_with(BEACON_ATTESTATION_PREFIX) {
         return Some(SubnetId::new(
-            u64::from_str_radix(topic.trim_start_matches(BEACON_ATTESTATION_PREFIX), 10).ok()?,
+            topic
+                .trim_start_matches(BEACON_ATTESTATION_PREFIX)
+                .parse::<u64>()
+                .ok()?,
         ));
     }
     None