message: chore: Add raw_unsubscribe_cmd accessor for message attributes
  Just to keep things symmetric
diff: @@ -102,6 +102,10 @@ pub struct DeviceMessageAttributes {
  }
  impl DeviceMessageAttributes {
  + pub fn raw_unsubscribe_cmd(&self) -> &Option<RawDeviceMessageAttributes> {
  + self.raw_subscribe_cmd()
  + }
  +
  pub fn message_allowed(&self, message_type: &ButtplugDeviceMessageType) -> bool {
  match message_type {
  ButtplugDeviceMessageType::ScalarCmd => self.scalar_cmd.is_some(),
  