niri: remove XDG_RUNTIME_DIR in check phase

[sodiboo]

• totally forgot about this when reviewing niri: 25.01 -> 25.02 and refactor #384183 lmao
• this is no longer necessary, as niri no longer creates a socket in tests: niri-wm/niri@0226d9a

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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[Defelo]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 384634

Logs: https://github.com/Defelo/nixpkgs-review-gha/actions/runs/13500824093

Download packages from cache:

• x86_64-linux

  nix-store -r --add-root nixpkgs-pr-384634-x86_64-linux \
    --option binary-caches 'https://cache.nixos.org/ https://attic.defelo.de/nixpkgs' \
    --option trusted-public-keys '
    cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
    nixpkgs:xeaAWa3crK09hMmFiygBeRmLq3hUjUShgaAwYVUEtw0=
    ' \
    /nix/store/03jpyvc7mnzmm3a6bipfcl2vwccs3d6h-niri-25.02 \
    /nix/store/jhrbn5v413nr8b9lbg0r729fjl8j8skw-stardust-xr-kiara-0-unstable-2024-07-13

• aarch64-linux

  nix-store -r --add-root nixpkgs-pr-384634-aarch64-linux \
    --option binary-caches 'https://cache.nixos.org/ https://attic.defelo.de/nixpkgs' \
    --option trusted-public-keys '
    cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
    nixpkgs:xeaAWa3crK09hMmFiygBeRmLq3hUjUShgaAwYVUEtw0=
    ' \
    /nix/store/m3fwi4l2b6phyd6cn58ifr3v1ziiv95h-niri-25.02 \
    /nix/store/j7jr7g00kgmhpvaww29jxj510917i8m1-stardust-xr-kiara-0-unstable-2024-07-13

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x86_64-linux

✅ 2 packages built:

• niri
• stardust-xr-kiara

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aarch64-linux

✅ 2 packages built:

• niri
• stardust-xr-kiara