steam: fix fhsenv version

[Stunkymonkey]

part of #336576

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[Pandapip1]

It appears that steam-unwrapped doesn't have a version

[Stunkymonkey]

It appears that steam-unwrapped doesn't have a version

steam-unwrapped can also be null... that is the current problem. I am leaving this as draft until fixed.

[Stunkymonkey]

@Pandapip1 in this MR, I am in favor of closing it.

[Atemu]

I think in the case of Steam it's actually intentional that it doesn't have a version.

While we do have a version of the Steam client that we fetch and provide (you should at least use that here), Steam updates itself outside of our control and could thereby update itself to be any version. I think it'd be confusing to claim that we are some specific version when in reality Steam will use whatever is the newest version.