treewide: format all inactive Nix files

After final improvements to the official formatter implementation,
this commit now performs the first treewide reformat of Nix files using it.
This is part of the implementation of RFC 166.

Only "inactive" files are reformatted, meaning only files that
aren't being touched by any PR with activity in the past 2 months.
This is to avoid conflicts for PRs that might soon be merged.
Later we can do a full treewide reformat to get the rest,
which should not cause as many conflicts.

A CI check has already been running for some time to ensure that new and
already-formatted files are formatted, so the files being reformatted here
should also stay formatted.

This commit was automatically created and can be verified using

    nix-build a08b3a4d19.tar.gz \
      --argstr baseRev 57b193d8dd
    result/bin/apply-formatting $NIXPKGS_PATH

nixos/modules/programs/command-not-found/command-not-found.nix

@@ -3,7 +3,12 @@
 # SQLite database that maps program names to Nix package names (e.g.,
 # "pdflatex" is mapped to "tetex").
 
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 let
   cfg = config.programs.command-not-found;
@@ -13,7 +18,10 @@ let
     src = ./command-not-found.pl;
     isExecutable = true;
     inherit (cfg) dbPath;
-    perl = pkgs.perl.withPackages (p: [ p.DBDSQLite p.StringShellQuote ]);
+    perl = pkgs.perl.withPackages (p: [
+      p.DBDSQLite
+      p.StringShellQuote
+    ]);
   };
 
 in
@@ -31,7 +39,7 @@ in
     };
 
     dbPath = lib.mkOption {
-      default = "/nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite" ;
+      default = "/nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite";
       description = ''
         Absolute path to programs.sqlite.
 
@@ -43,49 +51,47 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    programs.bash.interactiveShellInit =
-      ''
-        # This function is called whenever a command is not found.
-        command_not_found_handle() {
-          local p='${commandNotFound}/bin/command-not-found'
-          if [ -x "$p" ] && [ -f '${cfg.dbPath}' ]; then
-            # Run the helper program.
-            "$p" "$@"
-            # Retry the command if we just installed it.
-            if [ $? = 126 ]; then
-              "$@"
-            else
-              return 127
-            fi
+    programs.bash.interactiveShellInit = ''
+      # This function is called whenever a command is not found.
+      command_not_found_handle() {
+        local p='${commandNotFound}/bin/command-not-found'
+        if [ -x "$p" ] && [ -f '${cfg.dbPath}' ]; then
+          # Run the helper program.
+          "$p" "$@"
+          # Retry the command if we just installed it.
+          if [ $? = 126 ]; then
+            "$@"
           else
-            echo "$1: command not found" >&2
             return 127
           fi
-        }
-      '';
+        else
+          echo "$1: command not found" >&2
+          return 127
+        fi
+      }
+    '';
 
-    programs.zsh.interactiveShellInit =
-      ''
-        # This function is called whenever a command is not found.
-        command_not_found_handler() {
-          local p='${commandNotFound}/bin/command-not-found'
-          if [ -x "$p" ] && [ -f '${cfg.dbPath}' ]; then
-            # Run the helper program.
-            "$p" "$@"
+    programs.zsh.interactiveShellInit = ''
+      # This function is called whenever a command is not found.
+      command_not_found_handler() {
+        local p='${commandNotFound}/bin/command-not-found'
+        if [ -x "$p" ] && [ -f '${cfg.dbPath}' ]; then
+          # Run the helper program.
+          "$p" "$@"
 
-            # Retry the command if we just installed it.
-            if [ $? = 126 ]; then
-              "$@"
-            else
-              return 127
-            fi
+          # Retry the command if we just installed it.
+          if [ $? = 126 ]; then
+            "$@"
           else
-            # Indicate than there was an error so ZSH falls back to its default handler
-            echo "$1: command not found" >&2
             return 127
           fi
-        }
-      '';
+        else
+          # Indicate than there was an error so ZSH falls back to its default handler
+          echo "$1: command not found" >&2
+          return 127
+        fi
+      }
+    '';
 
     environment.systemPackages = [ commandNotFound ];
   };