[gimp] plug-ins: use new procedure.set_icon_name() in JavaScript demo.

[Jehan <jehanp src gnome org>]

commit 6ffd25b9f79753d636e266bd6f417ea5dc5f7110
Author: Jehan <jehan girinstud io>
Date:   Thu Aug 8 17:43:13 2019 +0200

    plug-ins: use new procedure.set_icon_name() in JavaScript demo.

 plug-ins/goat-exercises/goat-exercise-gjs.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/plug-ins/goat-exercises/goat-exercise-gjs.js b/plug-ins/goat-exercises/goat-exercise-gjs.js
index 81e12d6734..5b20e6d01e 100755
--- a/plug-ins/goat-exercises/goat-exercise-gjs.js
+++ b/plug-ins/goat-exercises/goat-exercise-gjs.js
@@ -77,8 +77,7 @@ var Goat = GObject.registerClass({
                                     "");
         procedure.add_menu_path ('<Image>/Filters/Development/Goat exercises/');
         procedure.set_attribution("Jehan", "Jehan", "2019");
-        /* TODO */
-        /*procedure.set_icon (Gimp.IconType.ICON_NAME, Gimp.ICON_GEGL);*/
+        procedure.set_icon_name(Gimp.ICON_GEGL);
 
 
         procedure.add_argument(GObject.param_spec_enum("run-mode",