message: remove unknown field module name
diff: @@ -194,7 +194,7 @@ pub enum EventDataView {
  #[serde(rename = "createaccount")]
  CreateAccount {},
  #[serde(rename = "unknown")]
  - Unknown { module_name: String },
  + Unknown {},
  }
  impl TryFrom<ContractEvent> for EventDataView {
  @@ -314,9 +314,7 @@ impl TryFrom<ContractEvent> for EventDataView {
  write_set: BytesView::from(upgrade_event.write_set()),
  }
  } else {
  - EventDataView::Unknown {
  - module_name: format!("{}", event.type_tag()),
  - }
  + EventDataView::Unknown {}
  };
  Ok(data)
  