message: Fix (probably false positive) clippy warning regarding `unwrap_or` call
diff: @@ -364,7 +364,7 @@ where
  responder.respond(validator_changes).ignore()
  }
  Event::DumpState(req @ DumpConsensusStateRequest { era_id, .. }) => {
  - let requested_era = era_id.unwrap_or(self.current_era());
  + let requested_era = era_id.unwrap_or_else(|| self.current_era());
  // We emit some log message to get some performance information and give the
  // operator a chance to find out why their node is busy.
  