tree-wide: format with nixfmt

Another saturday another useless formatter change.
It's my dotfiles, after all

alejandra doesn't handle c-style inline comments well.

shell.nix

@@ -1,30 +1,31 @@
 {
   sources ? import ./npins,
-  pkgs ?
-    import sources.nixpkgs {
-      overlays = map import [
-        ./nix/overlays/disko.nix
-      ];
-    },
+  pkgs ? import sources.nixpkgs {
+    overlays = map import [
+      ./nix/overlays/disko.nix
+    ];
+  },
   withGHC ? false,
-}: let
+}:
+let
   inherit (pkgs) lib;
 in
-  pkgs.mkShell {
-    packages = with pkgs;
-      [
-        just
-        jq
-        npins
-        disko
-      ]
-      ++ lib.optionals withGHC [
-        (haskellPackages.ghcWithPackages (self: [
-          self.xmonad-contrib
-          self.xmonad-extras
-          self.xmobar
-        ]))
-        haskell-language-server
-        cabal-install
-      ];
-  }
+pkgs.mkShell {
+  packages =
+    with pkgs;
+    [
+      just
+      jq
+      npins
+      disko
+    ]
+    ++ lib.optionals withGHC [
+      (haskellPackages.ghcWithPackages (self: [
+        self.xmonad-contrib
+        self.xmonad-extras
+        self.xmobar
+      ]))
+      haskell-language-server
+      cabal-install
+    ];
+}