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.

nix/homeModules/common/starship/default.nix

@@ -2,9 +2,11 @@
   lib,
   config,
   ...
-}: let
+}:
+let
   cfg = config.programs.starship;
-in {
+in
+{
   xdg.configFile = lib.mkIf cfg.enable {
     "starship.toml".source = "${./starship.toml}";
   };