rofi-emoji: add update script

pkgs/by-name/ro/rofi-emoji/package.nix

@@ -19,6 +19,8 @@
   waylandSupport ? true,
   wl-clipboard,
   wtype,
+
+  nix-update-script,
 }:
 
 stdenv.mkDerivation (final: {
@@ -68,6 +70,8 @@ stdenv.mkDerivation (final: {
     rofi-unwrapped
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Emoji selector plugin for Rofi";
     homepage = "https://github.com/Mange/rofi-emoji";