message: chore(legacy-plugin-chart-country-map): clean up dead code
  This override will not work because superset controls always use
  value from formData/explore state.
diff: @@ -42,11 +42,6 @@ const config: ControlPanelConfig = {
  choices: countryOptions,
  description: t('Which country to plot the map for?'),
  validators: [validateNonEmpty],
  - mapStateToProps(state, { value }) {
  - return {
  - value: value ? String(value).toLowerCase() : null,
  - };
  - },
  },
  },
  ],
  