Fix data check registration

aleksis/core/data_checks.py

@@ -202,7 +202,7 @@ class DataCheck:
 
         ct = ContentType.objects.get_for_model(instance)
         result, __ = DataCheckResult.objects.get_or_create(
-            check=cls.name, content_type=ct, object_id=instance.id
+            data_check=cls.name, content_type=ct, object_id=instance.id
         )
 
         # Track all existing problems (for deleting old results)