Add missing notify to job thread clear().  Probably not needed, but definitely doesn't hurt.
Add missing notify to job thread clear().  Probably not needed, but definitely
doesn't hurt.

mammadori/pyglet,mammadori/pyglet,oktayacikalin/pyglet,mammadori/pyglet,theblacklion/pyglet,theblacklion/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,mammadori/pyglet