message: Update "current era" metric also for initial era.
diff: @@ -327,7 +327,7 @@ where
  info!(era = era_id.value(), %our_id, "start voting");
  true
  };
  - if era_id > self.current_era {
  + if era_id >= self.current_era {
  self.current_era = era_id;
  self.metrics.current_era.set(era_id.value() as i64);
  }
  