actor: Fix set_scale_with_gravity()
actor: Fix set_scale_with_gravity()

Add a scale-gravity internal setter, and make set_scale_with_gravity()
call it, along with the scale factor.

djdeath/clutter,ebassi/clutter,jigpu/clutter,collects/clutter,djdeath/clutter-android,GNOME/clutter,djdeath/clutter-android,heysion/clutter-clone,heysion/clutter-clone,GNOME/clutter,djdeath/clutter-multithreaded,djdeath/clutter,Distrotech/clutter,GNOME/clutter,collects/clutter,ebassi/clutter,Distrotech/clutter,collects/clutter,djdeath/clutter,GNOME/clutter,collects/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter,Distrotech/clutter,heysion/clutter-clone,Distrotech/clutter,GNOME/clutter,kerrickstaley/clutter-vala,kerrickstaley/clutter-vala,Distrotech/clutter,djdeath/clutter-multithreaded,djdeath/clutter,jigpu/clutter,ebassi/clutter,kerrickstaley/clutter-vala,heysion/clutter-clone,jigpu/clutter,djdeath/clutter-multithreaded,djdeath/clutter-multithreaded,djdeath/clutter-android,kerrickstaley/clutter-vala,ebassi/clutter,heysion/clutter-clone,djdeath/clutter-android,collects/clutter,jigpu/clutter,djdeath/clutter-android,djdeath/clutter,jigpu/clutter,jigpu/clutter