refactor(wpcarro/emacs): Remove struct.el dep on dash.el

Simplifying the dependency graph of struct.el :)

Change-Id: I23f990d9f02f76d7f8b69c65f5d5090b1c572eed
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6028
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/emacs/pkgs/struct/default.nix

@@ -9,7 +9,6 @@ let
         src = ./struct.el;
         packageRequires =
           (with emacsPackages; [
-            dash
             s
           ]);
       })