[cli] Update tests for 404.html (#4597)
[cli] Update tests for 404.html (#4597)

Now that we updated api-deployments, we can remove this TODO and run tests agains `vercel dev` and real deployments.
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli