nix/flake: fix Ref.String() for github flakes w/ rev and ref #2467
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The string form of GitHub flakeref can only have a rev or a ref, not both. For example:
github:NixOS/nixpkgs/b321c8e818546d5491ee5611476500557b880856
github:NixOS/nixpkgs/nixpkgs-unstable
github:NixOS/nixpkgs/nixpkgs-unstable/b321c8e818546d5491ee5611476500557b880856
If both the Rev and Ref fields are set, use Rev.