Fix celery on_error

Author: T4rk1n

dash/long_callback/managers/celery_manager.py

@@ -90,7 +90,7 @@ def clear_cache_entry(self, key):
         self.handle.backend.delete(key)
 
     def call_job_fn(self, key, job_fn, args, context, on_error=None):
-        task = job_fn.delay(key, self._make_progress_key(key), args, context)
+        task = job_fn.delay(key, self._make_progress_key(key), args, context, on_error)
         return task.task_id
 
     def get_progress(self, key):

tests/integration/long_callback/test_basic_long_callback018.py

@@ -1,7 +1,7 @@
 from tests.integration.long_callback.utils import setup_long_callback_app
 
 
-def test_lcbc017_long_callback_set_props(dash_duo, manager):
+def test_lcbc018_background_callback_on_error(dash_duo, manager):
     with setup_long_callback_app(manager, "app_bg_on_error") as app:
         dash_duo.start_server(app)