message: hide swap history when hav't mnemonic
diff: @@ -766,6 +766,7 @@ class MarketmakerSettings extends Component<any, any> {
  </section>
  {/* Swaps history + Active swaps */}
  + { mnemonicSaved && (
  <section styleName={`${isDark ? 'dark' : '' }`}>
  <h2 styleName="section-title">
  <FormattedMessage
  @@ -842,6 +843,8 @@ class MarketmakerSettings extends Component<any, any> {
  </tbody>
  </table>
  </section>
  + )}
  +
  <FAQ
  isDark={isDark}
  