Fix waiting list tests

src/tests/api/test_waitinglist.py

@@ -37,6 +37,7 @@ TEST_WLE_RES = {
     "item": 2,
     "variation": None,
     "locale": "en",
+    "priority": 0,
     "subevent": None,
 }
 

src/tests/base/test_shredders.py

@@ -126,6 +126,7 @@ def test_waitinglist_shredder(event, item):
             'voucher': wle.voucher.pk,
             'created': wle.created.isoformat().replace('+00:00', 'Z'),
             'locale': 'en',
+            'priority': 0,
             'email': 'foo@example.org'
         }
     ]