Nox-review is broke

[ndowens]

Issue description

I believe #24133 caused nox-review to break as it gives undefind variable gtk in qt-5/5.7.nix

When looking at the changes I see gtk3 defind, but below i see gnome3.gtk(which would be the undefind one)

Steps to reproduce

nox-review anything

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)
• Nix version: (run nix-env --version)
• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion)

[globin]

Fixed on 17.03 at least, thought those were caused by cherry-picking, checking master right now.

Edit: looks good