fix: Cannot find declaration to go to CLEAN_DAY_SETTING (#10157)

Co-authored-by: 刘江波 <liujiangbo1@xiaomi.com>

api/schedule/clean_embedding_cache_task.py

@@ -14,7 +14,7 @@ from models.dataset import Embedding
 @app.celery.task(queue="dataset")
 def clean_embedding_cache_task():
     click.echo(click.style("Start clean embedding cache.", fg="green"))
-    clean_days = int(dify_config.CLEAN_DAY_SETTING)
+    clean_days = int(dify_config.PLAN_SANDBOX_CLEAN_DAY_SETTING)
     start_at = time.perf_counter()
     thirty_days_ago = datetime.datetime.now() - datetime.timedelta(days=clean_days)
     while True: