fix c# demo project to new onnx model files (#1689)

Dogvane Huang

2024-07-02 dfcc5d47587d3e793cbfec2e9509c0e9a9e1732c

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