Revert "prevent thread lock"

This reverts commit 88293cd587c3edb50f24d63d4885a9fe964d2ca1.

app_dialogue.py

@@ -1022,4 +1022,4 @@ with gr.Blocks(title="AI Meme Generator", theme=gr.themes.Base(), css=css) as de
         outputs=[template_gallery],
     )
 demo.queue(concurrency_count=8, max_size=40, api_open=False)
-demo.launch(max_threads=400, prevent_thread_lock=True)
+demo.launch(max_threads=400)