texture: Fix the async loop ceiling
texture: Fix the async loop ceiling

The comment says that we're going to load textures in a loop until we
still have work to do, or if one iteration took more than 5
milliseconds, to avoid blowing up our frame budget, but the check is for
5 seconds, which is hardly a sensible value.

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