treewide: Format all Nix files

Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:

  nix-build ci -A fmt.check

This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).

This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).

Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](8616af08d9/maintainers/scripts/auto-rebase).

If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.

nixos/modules/services/misc/dwm-status.nix

@@ -1,4 +1,9 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 let
   cfg = config.services.dwm-status;
 
@@ -26,7 +31,16 @@ in
       };
 
       order = lib.mkOption {
-        type = lib.types.listOf (lib.types.enum [ "audio" "backlight" "battery" "cpu_load" "network" "time" ]);
+        type = lib.types.listOf (
+          lib.types.enum [
+            "audio"
+            "backlight"
+            "battery"
+            "cpu_load"
+            "network"
+            "time"
+          ]
+        );
         description = ''
           List of enabled features in order.
         '';
@@ -44,7 +58,6 @@ in
 
   };
 
-
   ###### implementation
 
   config = lib.mkIf cfg.enable {