fst: support eng hotword

雾聪

2023-12-12 3c83d64c84602de055f503af7d4e2761c829ec2e

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