message: Improve the logging message.
diff: @@ -478,7 +478,8 @@ where
  Event::GetStoredFinalitySignaturesResult(fs, maybe_signatures) => {
  if let Some(signatures) = &maybe_signatures {
  if signatures.era_id != fs.era_id {
  - warn!(public_key=%fs.public_key, "Finality signature with invalid era id.");
  + warn!(public_key=%fs.public_key, expected=%signatures.era_id, got=%fs.era_id,
  + "finality signature with invalid era id.");
  // TODO: Disconnect from the sender.
  self.remove_from_pending_fs(&*fs);
  return Effects::new();
  