[bugfix] remove response before filter encoded failed data (#6315)

Author: hjh0119

swift/trainers/rlhf_trainer/grpo_trainer.py

@@ -1528,6 +1528,7 @@ def resample_encode_failed_inputs(self, inputs: DataType, n_try_fetch: int = 10)
             while True:
                 try:
                     # Attempt to encode the current sample.
+                    remove_response(current_data['messages'])
                     template.encode(current_data)
                     # If successful, store the result and update the last valid data.
                     inputs[i] = current_data