fix: alter Arxiv to ArXiv #918 (#1705)

### What problem does this PR solve?
fix: alter Arxiv to ArXiv #918
### Type of change

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

web/src/pages/flow/hooks.ts

@@ -93,7 +93,7 @@ export const useInitializeOperatorParams = () => {
       [Operator.Baidu]: initialBaiduValues,
       [Operator.Wikipedia]: initialWikipediaValues,
       [Operator.PubMed]: initialPubMedValues,
-      [Operator.Arxiv]: initialArxivValues,
+      [Operator.ArXiv]: initialArxivValues,
     };
   }, [llmId]);