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

Dogvane Huang

2024-07-02 dfcc5d47587d3e793cbfec2e9509c0e9a9e1732c

 runtime/onnxruntime/src/fsmn-vad-online.h

@@ -21,6 +21,8 @@
    std::vector<std::vector<int>> Infer(std::vector<float> &waves, bool input_finished);
    void ExtractFeats(float sample_rate, vector<vector<float>> &vad_feats, vector<float> &waves, bool input_finished);
    void Reset();
    int GetVadSampleRate() { return vad_sample_rate_; };

    // 2pass
    std::unique_ptr<Audio> audio_handle = nullptr;