Remove the unimplemented but ignored without='-E' parameters being passed to

script_helper.assert_python_failure().  No such feature has ever existed,
thus it doesn't do what the comment claims.  (It does add a 'without'
variable to the environment of the child process but that was not intended)

Lib/test/test_cmd_line.py

@@ -426,13 +426,11 @@ class CmdLineTest(unittest.TestCase):
         self.assertIn(b'Unknown option: -z', err)
         self.assertEqual(err.splitlines().count(b'Unknown option: -z'), 1)
         self.assertEqual(b'', out)
-        # Add "without='-E'" to prevent _assert_python to append -E
-        # to env_vars and change the output of stderr
-        rc, out, err = assert_python_failure('-z', without='-E')
+        rc, out, err = assert_python_failure('-z')
         self.assertIn(b'Unknown option: -z', err)
         self.assertEqual(err.splitlines().count(b'Unknown option: -z'), 1)
         self.assertEqual(b'', out)
-        rc, out, err = assert_python_failure('-a', '-z', without='-E')
+        rc, out, err = assert_python_failure('-a', '-z')
         self.assertIn(b'Unknown option: -a', err)
         # only the first unknown option is reported
         self.assertNotIn(b'Unknown option: -z', err)