message: Fix test_connection POST body
diff: @@ -157,7 +157,8 @@ const DatabaseModal: FunctionComponent<DatabaseModalProps> = ({
  SupersetClient.post({
  endpoint: 'api/v1/database/test_connection',
  - postPayload: JSON.stringify(connection),
  + body: JSON.stringify(connection),
  + headers: { 'Content-Type': 'application/json' },
  })
  .then(() => {
  addSuccessToast(t('Connection looks good!'));
  