Fix missplace for vector sim weight and token sim weight. (#4627)

### What problem does this PR solve?

#4610

### Type of change

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

api/apps/sdk/chat.py

     res["prompt"] = renamed_dict
     del res["prompt_config"]
     new_dict = {"similarity_threshold": res["similarity_threshold"],
-                "keywords_similarity_weight": res["vector_similarity_weight"],
+                "keywords_similarity_weight": 1-res["vector_similarity_weight"],
                 "top_n": res["top_n"],
                 "rerank_model": res['rerank_id']}
     res["prompt"].update(new_dict)
         res["prompt"] = renamed_dict
         del res["prompt_config"]
         new_dict = {"similarity_threshold": res["similarity_threshold"],
-                    "keywords_similarity_weight": res["vector_similarity_weight"],
+                    "keywords_similarity_weight": 1-res["vector_similarity_weight"],
                     "top_n": res["top_n"],
                     "rerank_model": res['rerank_id']}
         res["prompt"].update(new_dict)