Correct docs and test of restricted JWTs.

The comment is misleading beacuse now that restricted JWTs are enforced
everywhere, we don't need to set the expiry to be in the past for JWT
tokens.

openedx/core/djangoapps/oauth_dispatch/tests/test_views.py

@@ -270,25 +270,22 @@ class TestAccessTokenView(AccessTokenLoginMixin, mixins.AccessTokenMixin, _Dispa
         ]
         mock_set_custom_metric.assert_has_calls(expected_calls, any_order=True)
 
-    @ddt.data(True, False)
-    def test_restricted_jwt_access_token(self, expiration_expected):
+    def test_restricted_jwt_access_token(self):
         """
-        Verify that when requesting a JWT token from a restricted Application
-        within the DOT subsystem, that our claims is marked as already expired
-        (i.e. expiry set to Jan 1, 1970)
+        Verify that we get a restricted JWT that is not expired.
         """
         response = self._post_request(self.user, self.restricted_dot_app, token_type='jwt')
         self.assertEqual(response.status_code, 200)
         data = json.loads(response.content.decode('utf-8'))
 
         self.assertIn('expires_in', data)
-        self.assertEqual(data['expires_in'] < 0, expiration_expected)
+        assert data['expires_in'] > 0
         self.assertEqual(data['token_type'], 'JWT')
         self.assert_valid_jwt_access_token(
             data['access_token'],
             self.user,
             data['scope'].split(' '),
-            should_be_expired=expiration_expected,
+            should_be_expired=False,
             should_be_asymmetric_key=True,
             should_be_restricted=True,
         )