formatted zsh and replaced manual flakeLocation with universal

modules/features/zsh/default.nix

@@ -25,15 +25,13 @@
   });
   perSystem = {
     pkgs,
-    lib,
     self',
+    lib,
+    flakeLocation,
     ...
   }: {
     packages = {
-      zsh = let
-        flakeLocation = builtins.getEnv "PWD";
-      in
-        lib.warnIf (flakeLocation == "") "Flake Location is undefined. Are you building in the right directory?"
+      zsh = lib.warnIf (flakeLocation == "") "Flake Location is undefined. Are you building in the right directory?"
       inputs.wrappers.wrappers.zsh.wrap {
         inherit pkgs;
         runtimePkgs = [pkgs.carapace pkgs.devenv pkgs.fzf];