Fix: export-onnx.py(expected all tensors to be on the same device) (#1699)

由于SenseVoiceSmall.from_pretrained()
    调用的funasr.auto.auto_model.AutoModel.build_model()默认device是cuda
    (在cuda available的环境中)
    ```py
    device = kwargs.get("device", "cuda")
    if not torch.cuda.is_available() or kwargs.get("ngpu", 1) == 0:
        device = "cpu"
        kwargs["batch_size"] = 1
    kwargs["device"] = device
    ```
    而export-onnx.py里的tensor默认都是cpu, 导致
    RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu
    所以直接在加载model的时候指定cpu

@@ -119,7 +119,7 @@ def display_params(params):
 
 
 def main():
-    model, params = SenseVoiceSmall.from_pretrained(model="iic/SenseVoiceSmall")
+    model, params = SenseVoiceSmall.from_pretrained(model="iic/SenseVoiceSmall", device="cpu")
     display_params(params)
 
     generate_tokens(params)