message: Fix typo in `protocol_version`, that accidentally made it a method call
diff: @@ -305,7 +305,7 @@ where
  };
  let chain_info = chain_info_source.into();
  - let protocol_version = chain_info.protocol_version();
  + let protocol_version = chain_info.protocol_version;
  let context = Arc::new(NetworkContext {
  event_queue,
  our_id: NodeId::from(&small_network_identity),
  