correct contribution tests by setting proper init values

otherwise depending on the order in which the tests run, some of
them would randomly crash because livesettings had been modified
by a previous test.

ippisite/ippidb/tests/tests_contribute.py

@@ -47,6 +47,7 @@ class ContributionViewsAccessTestCase(TestCase):
         )
 
     def test_403_without_perm_and_access_closed(self):
+        live_settings.open_access_to_contribution = "False"
         self.client.force_login(self.user)
         response = self.client.get(self.url)
         self.assertEqual(response.status_code, 403)
@@ -80,6 +81,7 @@ class ContributionViewsAccessTestCase(TestCase):
         self.assertEqual(response.status_code, 302)
 
     def test_ko_with_staff(self):
+        live_settings.open_access_to_contribution = "False"
         self.user.is_staff = True
         self.user.save()
         self.client.force_login(self.user)