Lock/unlock in GNOME 3.8 : drift of space in left corner

[mathematicalcoffee]

Hi Amy,
I noticed a small bug:
locking-unlocking the screen add a small space in the top left corner, with a slow drift of the "Activities" text.
Cheers,
Donato
(GNOME 3.8, GNOME3.8 version)

[m.c: probably forgetting to destroy the leftActor so it keeps getting re-added]

[mathematicalcoffee]

Fixed, released on e.g.o

[mathematicalcoffee]

Fix was bad; causes #19