message: remove unused default block
diff: <div>xDai balance: <span data-test-xdai-balance>{{format-token-amount this.layer2Network.defaultTokenBalance}}</span></div>
  <Boxel::CtaBlock @state='memorialized'>
  - <:default></:default>
  <:memorialized as |m|>
  <m.ActionButton {{on "click" this.disconnect}}>
  Disconnect Wallet
  