message: Remove unnecessary message prop from Snackbar
  When the Snackbar has children, the message prop is ignored, so we can
  remove it from here to simplify the component.
  cf.
diff: @@ -46,11 +46,7 @@ export const AlertDisplay = () => {
  };
  return (
  - <Snackbar
  - open
  - message={firstMessage.message.toString()}
  - anchorOrigin={{ vertical: 'top', horizontal: 'center' }}
  - >
  + <Snackbar open anchorOrigin={{ vertical: 'top', horizontal: 'center' }}>
  <Alert
  action={
  <IconButton
  