fix bug, ys_pad_masked in sampler of paraformer

游雁

2023-01-30 cfb2fda87c29db780e595b75f2de1c7710ebadd2

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X    1
XX    2
XXX    3
XL    4
L    5
LX    6
LXX    7
LXXX    8
XC    9