Fix base manager permission check

src/core/models/base_managers.py

@@ -179,7 +179,7 @@ class ConferenceManagerMixin(models.Manager, Generic[_ModelType]):
         if not isinstance(member, ConferenceMember):
             return qs.none()
         if member.is_staff and staff_can_manage:
-            if self.staff_permissions is None or (self.staff_permissions and member.has_staff_permission(self.staff_permissions)):
+            if self.staff_permissions is None or (self.staff_permissions and member.has_staff_permission(*self.staff_permissions)):
                 return qs
         return (
             qs.filter(