bpo-35660: Fix imports in idlelib.window (GH-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.
(cherry picked from commit 11303dd)

Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>

Author: miss-islington

Lib/idlelib/window.py

@@ -1,4 +1,5 @@
-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

@@ -0,0 +1 @@
+Fix imports in idlelib.window.