Don't set atspi timeout

Looking at the code I'm unconvinced this behaves as expected,
in certain cases at least. So reverting it for now to avoid
confusion.

src/sugar3/test/uitree.py

@@ -24,8 +24,6 @@ import time
 from gi.repository import Atspi
 from gi.repository import GLib
 
-Atspi.set_timeout(-1, -1)
-
 
 def get_root():
     return Node(Atspi.get_desktop(0))