tests: Fix test-script.json
tests: Fix test-script.json

A trailing comma is breaking the validity of test-script.json

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