Refactor: when pyopenjtalk_worker is called without initialization, continue processing without a worker

When using style-bert-vits2 as a library, the requirement to be able to launch it in multiple processes may not be necessary. Also, if the library is embedded and exe-ed using PyInstaller or similar, it is difficult to make pyopenjtalk_worker run in a separate process.
Therefore, we changed it so that the worker is used only when it is explicitly initialized.

server_editor.py

@@ -151,7 +151,7 @@ def save_last_download(latest_release):
 
 # pyopenjtalk_worker を起動
 ## pyopenjtalk_worker は TCP ソケットサーバーのため、ここで起動する
-pyopenjtalk.initialize()
+pyopenjtalk.initialize_worker()
 
 # pyopenjtalk の辞書を更新
 update_dict()