fix bug in predictor tail_process_fn

lzr265946

2023-02-09 983bb9382ebcbd29c8c59251b4bcbd328bdf3bf1

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7