Add a patch for restart-emacs

Before this change, trying to use `doom/restart-and-restore` would
result in a failed to load `default.el` as the wrong binary would be launched.

This fixes that.

overrides.nix

@@ -71,6 +71,10 @@ self: super: {
     pname = "php-extras";
   };
 
+  restart-emacs = super.restart-emacs.overrideAttrs (esuper: {
+    patches = [ ./restart-emacs.patch ];
+  });
+
   revealjs = self.straightBuild {
     pname = "revealjs";