Convert return values from list primitives to Urbi.
Convert return values from list primitives to Urbi.

	* src/object/cxx-primitive.hxx.py: Apply forgotten C++/Urbi conversion.

urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi