fix cpp ws client not exit when finished problem (#628)

zhaomingwork

2023-06-14 dde24214fecb1178f5c130f09ad162a1e5847877

 egs/aishell/transformer/path.sh

@@ -3,3 +3,5 @@
# NOTE(kan-bayashi): Use UTF-8 in Python to avoid UnicodeDecodeError when LC_ALL=C
export PYTHONIOENCODING=UTF-8
export PATH=$FUNASR_DIR/funasr/bin:$PATH

export OMP_NUM_THREADS=1