fix: node env in pages/layout.js

[DaniAcu]

Right now, the repo is broken. When you try to run next dev it breaks because the NODE_ENV check is wrong. I just updated to start checking the right value.

Before:

After:

[vercel[bot]]

@DaniAcu is attempting to deploy a commit to the darkroom Team on Vercel.

A member of the Team first needs to authorize it.

[clementroche]

Thank you @DaniAcu