small fixes

model.py

@@ -710,10 +710,10 @@ def _get_paraformer_zh_pre_trained_model(
     nn_model = _get_nn_model_filename(
         repo_id=repo_id,
         filename="model.onnx",
-        subfolder="./",
+        subfolder=".",
     )
 
-    tokens = _get_token_filename(repo_id=repo_id, subfolder="./")
+    tokens = _get_token_filename(repo_id=repo_id, subfolder=".")
 
     recognizer = sherpa_onnx.OfflineRecognizer.from_paraformer(
         paraformer=nn_model,