fix demo in egs_modelscope vad

lzr265946

2023-02-17 861f2f26056aea26da1a9eedc2f0288e07254ec2

 funasr/runtime/python/grpc/grpc_main_server.py

@@ -1,8 +1,9 @@
import grpc
from concurrent import futures
import argparse

import paraformer_pb2_grpc
from grpc_server import ASRServicer
import grpc
import argparse

def serve(args):
      server = grpc.server(futures.ThreadPoolExecutor(max_workers=10),