actor: Expand is_in_clone_paint() check
actor: Expand is_in_clone_paint() check

The function should return true not only if the actor is being painted
by a ClutterClone, but also if it's inside a sub-graph being painted by
a ClutterClone.

https://bugzilla.gnome.org/show_bug.cgi?id=756371

GNOME/clutter,GNOME/clutter,GNOME/clutter,GNOME/clutter,GNOME/clutter