fix test for is_item_still_editable helper update

tracim/tracim/tests/library/test_helpers.py

         item.created = datetime.datetime.now() - datetime.timedelta(0, 10)
 
         item.type = DictLikeClass({'id': 5})
-        eq_(False, h.is_item_still_editable(item))
+        eq_(False, h.is_item_still_editable(config, item))
 
         item.type.id = 'comment'
-        eq_(False, h.is_item_still_editable(item))
+        eq_(False, h.is_item_still_editable(config, item))
 
         config.DATA_UPDATE_ALLOWED_DURATION = -1
         item.type.id = 'comment'
         item.created = datetime.datetime.now() - datetime.timedelta(0, 10)
-        eq_(True, h.is_item_still_editable(item))
+        eq_(True, h.is_item_still_editable(config, item))
 
         config.DATA_UPDATE_ALLOWED_DURATION = 12
         item.created = datetime.datetime.now() - datetime.timedelta(0, 10)
-        eq_(True, h.is_item_still_editable(item), 'created: {}, now: {}'.format(item.created, datetime.datetime.now())) # This test will pass only if the test duration is less than 120s !!!
+        eq_(True, h.is_item_still_editable(config, item), 'created: {}, now: {}'.format(item.created, datetime.datetime.now())) # This test will pass only if the test duration is less than 120s !!!
 
         config.DATA_UPDATE_ALLOWED_DURATION = 8
         item.created = datetime.datetime.now() - datetime.timedelta(0, 10)
-        eq_(False, h.is_item_still_editable(item))
+        eq_(False, h.is_item_still_editable(config, item))