message: [now-cli] Fix error message link to build logs
  The current error message prints a link that is not clickable from the terminal.
  This PR adds the missing `https://` protocol prefix, so that the link is clickable.
diff: @@ -666,7 +666,7 @@ export default async function main(
  if (err instanceof BuildError) {
  output.error('Build failed');
  output.error(
  - `Check your logs at ${now.url}/_logs or run ${code(
  + `Check your logs at https://${now.url}/_logs or run ${code(
  `now logs ${now.url}`,
  {
  // Backticks are interpreted as part of the URL, causing CMD+Click
  