Fix:wrong param in meta_data_filter (#10978)

### What problem does this PR solve?
change:
wrong param in meta_data_filter

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/constants/chat.ts

@@ -35,6 +35,6 @@ export const EmptyConversationId = 'empty';
 
 export enum DatasetMetadata {
   Disabled = 'disabled',
-  Automatic = 'automatic',
+  Automatic = 'auto',
   Manual = 'manual',
 }