Revert "disable queue again"

This reverts commit 346acb3a1fde0bdfc017dcbbb717e14242247922.

app.py

@@ -83,7 +83,7 @@ def main():
                              progress_text,
                          ])
 
-    # demo.queue(max_size=5)
+    demo.queue(max_size=5)
     demo.launch(debug=True)