Gravity Forms: refactor gform_confirmation filter anonymous callback

Hi there!

There’s a Gravity Forms filter on gform_confirmation that’s hooked into an anonymous callback, which means that I can’t easily change it with remove_filter. Could you please refactor it to a named callback so that I can remove the filter?

Another thought– to be a bit more future-proof, you could add a filter inside the callback to deactivate it, e.g.:

$show_confirmation = apply_filters('show_oopspam_confirmation', true);
if ($show_confirmation === false) {
  return $confirmation;
}

This way, if the gform_confirmation hook priority level changes, people who want to override this feature can still do that.