message: listen for disconnection in layer-two-connect-card
diff: ...attributes
  >
  {{#if (eq this.cardState 'memorialized')}}
  + <Listener
  + @emitter={{this.layer2Network}}
  + @event="disconnect"
  + @action={{optional @onIncomplete}}
  + />
  <ActionCardContainer::Section
  @title="Card Wallet"
  @imgUrl={{this.cardstackLogo}}
  