[3.6] bpo-29919 Remove unused imports from idlelib [GH-137] (#2105)

Part of patch by Victor Stinner.
(cherry-pick from d6debb24e06152a827769b0cac24c47deccdeac1)
diff --git a/Lib/idlelib/query.py b/Lib/idlelib/query.py
index 3b1f1e2..5935063 100644
--- a/Lib/idlelib/query.py
+++ b/Lib/idlelib/query.py
@@ -24,7 +24,7 @@
 import os
 from sys import executable, platform  # Platform is set for one test.
 
-from tkinter import Toplevel, StringVar, W, E, N, S
+from tkinter import Toplevel, StringVar, W, E, S
 from tkinter.ttk import Frame, Button, Entry, Label
 from tkinter import filedialog
 from tkinter.font import Font