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