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

slin000111

2025-09-20 88b464edb94531ba98744a5338965af539ab18ec

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.