bpo-35660: Fix imports in idlelib.window (#11434)

* bpo-35660: IDLE: Remove * import from window.py

* sys was being imported through the *, so also added an import sys.

* Update 2019-01-04-19-14-29.bpo-35660.hMxI7N.rst

Anyone who wants details can check the issue, where I added the point about the sys import bug.

Lib/idlelib/window.py

-from tkinter import *
+from tkinter import Toplevel, TclError
+import sys
 
 
 class WindowList:

Misc/NEWS.d/next/IDLE/2019-01-04-19-14-29.bpo-35660.hMxI7N.rst

+Fix imports in idlelib.window.