fix: show live link for revisions

[boazpoolman]

This pull request is for: (mark with an "x")

• [ ] examples/*
• [x] modules/next
• [ ] packages/next-drupal
• [ ] starters/basic-starter
• [ ] starters/graphql-starter
• [ ] starters/pages-starter
• [ ] Other

GitHub Issue #859

Describe your changes

Show the live_link button for revisions.

I've also added a patch that you can add to the composer.json of your project:

show-live-link.patch