Fix prefix concatenation in timestamp post-processing for sensevoice (#2670)

slin000111

2025-09-20 88b464edb94531ba98744a5338965af539ab18ec

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export FUNASR_RUNTIME_ROOT=`pwd`/../
export PATH=$FUNASR_RUNTIME_ROOT/onnxruntime/build/bin:$PWD:$PATH
export LC_ALL=C