Fix 'airflow dags backfill --reset-dagruns' errors when run twice (#2…

…1062)

Co-authored-by: uplsh <uplsh@linecorp.com>
(cherry picked from commit d97e2ba)

airflow/cli/commands/dag_command.py

@@ -47,7 +47,7 @@
 )
 from airflow.utils.dot_renderer import render_dag
 from airflow.utils.session import create_session, provide_session
-from airflow.utils.state import State
+from airflow.utils.state import DagRunState
 
 
 @cli_utils.action_logging
@@ -105,7 +105,7 @@ def dag_backfill(args, dag=None):
                 end_date=args.end_date,
                 confirm_prompt=not args.yes,
                 include_subdags=True,
-                dag_run_state=State.NONE,
+                dag_run_state=DagRunState.QUEUED,
             )
 
         try: