[gimp] goat-exercise: fix ability to load js

[Jehan <jehanp src gnome org>]

commit bce3bf23de401ee7d63558db6ed90222d2930465
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Tue Oct 4 18:02:38 2022 +0100

    goat-exercise: fix ability to load js
    
    However, this is still currently crashing on MacOS.

 extensions/goat-exercises/goat-exercise-gjs.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/extensions/goat-exercises/goat-exercise-gjs.js b/extensions/goat-exercises/goat-exercise-gjs.js
index 8b3d9d45c9..974696a562 100755
--- a/extensions/goat-exercises/goat-exercise-gjs.js
+++ b/extensions/goat-exercises/goat-exercise-gjs.js
@@ -1,4 +1,4 @@
-#!/usr/bin/gjs
+#!/usr/bin/env gjs
 
 /* GIMP - The GNU Image Manipulation Program
  * Copyright (C) 1995 Spencer Kimball and Peter Mattis