scripts/install-systemd-multi-user.sh: fix another typo
scripts/install-systemd-multi-user.sh: fix another typo

NixOS/nix,rycee/nix,rycee/nix,rycee/nix,NixOS/nix,NixOS/nix,NixOS/nix,rycee/nix,NixOS/nix,rycee/nix