container: use CLUTTER_IS_ACTOR on correct parameter
container: use CLUTTER_IS_ACTOR on correct parameter

clutter_container_create_child_meta() uses CLUTTER_IS_ACTOR on the
container parameter instead of the actor parameter.

http://bugzilla.openedhand.com/show_bug.cgi?id=2087

Signed-off-by: Emmanuele Bassi <049ee2061f71220e5aaf33f5be422fc2a2b06a44@linux.intel.com>

nobled/clutter,spatulasnout/clutter,collects/clutter,Distrotech/clutter,djdeath/clutter-android,ebassi/clutter,djdeath/clutter-android,GNOME/clutter,ebassi/clutter,jigpu/clutter,ebassi/clutter,GNOME/clutter,djdeath/clutter-multithreaded,djdeath/clutter-multithreaded,ebassi/clutter,djdeath/clutter-multithreaded,collects/clutter,djdeath/clutter,djdeath/clutter-android,jigpu/clutter,nobled/clutter,rkudiyarov/clutter_osx,jigpu/clutter,kerrickstaley/clutter-vala,dlespiau/clutter,heysion/clutter-clone,spatulasnout/clutter,dlespiau/clutter,jigpu/clutter,spatulasnout/clutter,collects/clutter,Distrotech/clutter,Distrotech/clutter,GNOME/clutter,GNOME/clutter,heysion/clutter-clone,collects/clutter,kerrickstaley/clutter-vala,dlespiau/clutter,jigpu/clutter,collects/clutter,heysion/clutter-clone,nobled/clutter,jigpu/clutter,rkudiyarov/clutter_osx,djdeath/clutter,Distrotech/clutter,rkudiyarov/clutter_osx,djdeath/clutter-android,kerrickstaley/clutter-vala,djdeath/clutter,heysion/clutter-clone,djdeath/clutter,kerrickstaley/clutter-vala,heysion/clutter-clone,djdeath/clutter,djdeath/clutter-multithreaded,rkudiyarov/clutter_osx,spatulasnout/clutter,GNOME/clutter,ebassi/clutter,Distrotech/clutter,spatulasnout/clutter,djdeath/clutter-android,Distrotech/clutter,djdeath/clutter