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/fish/aliasesAbbrs.nix

@@ -2,7 +2,8 @@
   pkgs,
   lib,
   ...
-}: {
+}:
+{
   programs.fish = {
     shellAbbrs = lib.mkMerge [
       (lib.mkIf pkgs.stdenv.isLinux {