MDL-21657 fixed regression in function call after its API change
MDL-21657 fixed regression in function call after its API change

The API of the function forum_print_posts_threaded() was changed in
63e87951e6ce93aadc2b891556bf832fe4b5226c but this call was not updated.
This led to not displaying other replies when replying to a forum post.

dilawar/moodle