gpu-screen-recorder: Install the systemd unit again

[timschumi]

The systemd unit got removed by #339874, add it back before too many people don't notice that their screen recorder doesn't autostart anymore.

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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[DontEatOreo]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 350956 --extra-nixpkgs-config '{ allowAliases = false; allowBroken = false; allowUnfree = true; checkMeta = true; cudaSupport = true; cudaCapabilities = [ "7.5" ]; }'

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x86_64-linux

✅ 2 packages built:

• gpu-screen-recorder
• gpu-screen-recorder-gtk

[Artturin]

Is the patch that was removed still needed?

[timschumi]

No, I upstreamed it.