Fix: Reset sample-buffer after processing (#1521)

Co-authored-by: VEP <517138883@qq.com>

python-api-examples/two-pass-speech-recognition-from-microphone.py

@@ -427,7 +427,6 @@ def main():
                     )
                     print("\r{}:{}".format(segment_id, result), flush=True)
                     segment_id += 1
-                else:
                     sample_buffers = []
 
                 first_recognizer.reset(stream)