fix return value of the delete_event signal class handler
fix return value of the delete_event signal class handler

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