message: chore: Update no device communication manager on start scan message
  Just make the error a bit clearer because this happens a lot.
diff: @@ -124,7 +124,7 @@ impl DeviceManager {
  mgr.start_scanning().await?;
  }
  if self.comm_managers.is_empty() {
  - Err(ButtplugUnknownError::new("No device managers!").into())
  + Err(ButtplugUnknownError::new("Cannot start scanning. Server has no device communication managers to scan with.").into())
  } else {
  Ok(())
  }
  