[3.15] gh-151428: Remove unused imports in idlelib.idle_test (GH-151478) (#152916)

Lib/idlelib/idle_test/template.py

@@ -1,6 +1,5 @@
 "Test , coverage %."
 
-from idlelib import zzdummy
 import unittest
 from test.support import requires
 from tkinter import Tk

Lib/idlelib/idle_test/test_help.py

@@ -4,7 +4,6 @@ from idlelib import help
 import unittest
 from test.support import requires
 requires('gui')
-from os.path import abspath, dirname, join
 from tkinter import Tk