Fix issue with fullscreen not appearing (fixes #1445)

[andrewn]

Fixes #1445

There's more that we should do for this, but I'll do a follow-up PR:

• Show 404 if project is not found
• Write tests so we know if this page fails because of some change elsewhere

I have verified that this pull request:

• has no linting errors (npm run lint)
• is from a uniquely-named feature branch and has been rebased on top of the latest master. (If I was asked to make more changes, I have made sure to rebase onto master then too)
• is descriptively named and links to an issue number, i.e. Fixes #123

[catarak]

yay thank you!!