bugfix: audio_len should be 1D, no 0D, which will raise list index out (#3490)

of range error in the following decode process

Co-authored-by: Luzhenhui <luzhenhui@mqsz.com>

paddlespeech/cli/asr/infer.py

@@ -274,7 +274,7 @@ class ASRExecutor(BaseExecutor):
             # fbank
             audio = preprocessing(audio, **preprocess_args)
 
-            audio_len = paddle.to_tensor(audio.shape[0]).unsqueeze(axis=0)
+            audio_len = paddle.to_tensor([audio.shape[0]]).unsqueeze(axis=0)
             audio = paddle.to_tensor(audio, dtype='float32').unsqueeze(axis=0)
 
             self._inputs["audio"] = audio