Fix seaco onnx export bug (#2325)

zhong zhuang

2024-12-21 fcb2102a602b39777fce9a7c197dbb6442eeba55

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BAC009S0764W0121 <|Speech|>
BAC009S0916W0489 <|Speech|>
asr_example_cn_en <|Speech|>
ID0012W0014 <|Speech|>