kodi.packages: add update script for addons from kodi repository

pkgs/applications/video/kodi-packages/inputstreamhelper/default.nix

@@ -1,4 +1,4 @@
-{ lib, buildKodiAddon, fetchzip }:
+{ lib, buildKodiAddon, fetchzip, addonUpdateScript }:
 buildKodiAddon rec {
   pname = "inputstreamhelper";
   namespace = "script.module.inputstreamhelper";
@@ -9,6 +9,10 @@ buildKodiAddon rec {
     sha256 = "18lkksljfa57w69yklbldf7dgyykrm84pd10mdjdqdm88fdiiijk";
   };
 
+  passthru.updateScript = addonUpdateScript {
+    attrPath = "kodi.packages.inputstreamhelper";
+  };
+
   meta = with lib; {
     homepage = "https://github.com/emilsvennesson/script.module.inputstreamhelper";
     description = "A simple Kodi module that makes life easier for add-on developers relying on InputStream based add-ons and DRM playback";