fix: delete useless code

Author: ChenZiHong-Gavin

graphgen/operators/rephrase/rephrase_service.py

@@ -55,7 +55,6 @@ def process(self, batch: list) -> Tuple[list, dict]:
             if not rephrased:
                 continue
             rephrased["_trace_id"] = self.get_trace_id(rephrased)
-            results.append(rephrased)
             meta_updates.setdefault(input_trace_id, []).append(rephrased["_trace_id"])
             final_results.append(rephrased)