message: Disable 'start' button after clicking in VerificationPanel
diff: @@ -88,7 +88,7 @@ export default class VerificationPanel extends React.PureComponent {
  <div className='mx_VerificationPanel_QRPhase_startOption'>
  <p>{_t("Compare unique emoji")}</p>
  <span className='mx_VerificationPanel_QRPhase_helpText'>{_t("Compare a unique set of emoji if you don't have a camera on either device")}</span>
  - <AccessibleButton onClick={this._startSAS} kind='primary'>
  + <AccessibleButton disabled={this.state.emojiButtonClicked} onClick={this._startSAS} kind='primary'>
  {_t("Start")}
  </AccessibleButton>
  </div>
  