remove redundant trace message

```
sync: Too many full nodes, rejecting 12D3KooWSQAP2fh4qBkLXBW4mvCtbAiK8sqMnExWHHTZtVAxZ8bQ
sync: 12D3KooWSQAP2fh4qBkLXBW4mvCtbAiK8sqMnExWHHTZtVAxZ8bQ disconnected
```

is enough to understand that we've refused to connect to the given peer

client/network/src/protocol.rs

@@ -1147,11 +1147,6 @@ where
 					if self.on_sync_peer_disconnected(peer_id).is_ok() {
 						CustomMessageOutcome::SyncDisconnected(peer_id)
 					} else {
-						log::trace!(
-							target: "sync",
-							"Disconnected peer which had earlier been refused by on_sync_peer_connected {}",
-							peer_id
-						);
 						CustomMessageOutcome::None
 					}
 				} else if self.bad_handshake_substreams.remove(&(peer_id, set_id)) {