message: Fix impl ToBytes for EraEnd
diff: @@ -301,7 +301,9 @@ impl ToBytes for EraEnd {
  }
  fn serialized_length(&self) -> usize {
  - self.equivocators.serialized_length() + self.rewards.serialized_length()
  + self.equivocators.serialized_length()
  + + self.rewards.serialized_length()
  + + self.inactive_validators.serialized_length()
  }
  }
  