message: Fix verification toast timeouts to not stick at 0
  Fixes:
diff: @@ -33,11 +33,13 @@ export default class VerificationRequestToast extends React.PureComponent {
  componentDidMount() {
  const {request} = this.props;
  + if (request.timeout && request.timeout > 0) {
  this._intervalHandle = setInterval(() => {
  let {counter} = this.state;
  counter = Math.max(0, counter - 1);
  this.setState({counter});
  }, 1000);
  + }
  request.on("change", this._checkRequestIsPending);
  // We should probably have a separate class managing the active verification toasts,
  // rather than monitoring this in the toast component itself, since we'll get problems
  @@ -120,10 +122,11 @@ export default class VerificationRequestToast extends React.PureComponent {
  nameLabel = _t("%(name)s (%(userId)s)", {name: user.displayName, userId});
  }
  }
  + const declineLabel = this.state.counter == 0 ? _t("Decline") : _t("Decline (%(counter)s)", {counter: this.state.counter});
  return (<div>
  <div className="mx_Toast_description">{nameLabel}</div>
  <div className="mx_Toast_buttons" aria-live="off">
  - <FormButton label={_t("Decline (%(counter)s)", {counter: this.state.counter})} kind="danger" onClick={this.cancel} />
  + <FormButton label={declineLabel} kind="danger" onClick={this.cancel} />
  <FormButton label={_t("Accept")} onClick={this.accept} />
  </div>
  </div>);
  