fix paraformer online fbank cache bug

haoneng.lhn

2023-05-18 47bd60924c47baefd37f9f12866ec0d24055bc62

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beam_size: 60
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.3
lm_weight: 0.0