fix: read model order list from correct config key

Author: Algorithm5838

backend/open_webui/main.py

@@ -847,7 +847,7 @@ async def get_models(request: Request, refresh: bool = False, user=Depends(get_v
 
         models.append(model)
 
-    model_order_list = await Config.get('models.order_list')
+    model_order_list = await Config.get('ui.model_order_list')
     if model_order_list:
         model_order_dict = {model_id: i for i, model_id in enumerate(model_order_list)}
         # Sort models by order list priority, with fallback for those not in the list