nixos/dbus: Avoid redundant output specification
nixos/dbus: Avoid redundant output specification

- Do not use `daemon`, it has been synonymous to `out` since https://github.com/NixOS/nixpkgs/commit/783c40eb68bbbcb9cf6918255157ecab55eedb6e
- Do not use explicit `out` output, it has been default since https://github.com/NixOS/nixpkgs/commit/a17216af4c82dbeb33030355664d96875558f7ac (originally introduced in https://github.com/NixOS/nixpkgs/commit/2132c86c45de67842f9b1237f3a0d1f242dce7ec)

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