share gradio by default (unless gradio_share is set to false)

Gradio_UI.py

@@ -290,7 +290,7 @@ class GradioUI:
                 [stored_messages, text_input],
             ).then(self.interact_with_agent, [stored_messages, chatbot], [chatbot])
 
-        demo.launch(debug=True, share=os.getenv("GRADIO_SHARE") == "true", **kwargs)
-
+        share = not os.getenv("GRADIO_SHARE") == "false"
+        demo.launch(debug=True, share=share, **kwargs)
 
 __all__ = ["stream_to_gradio", "GradioUI"]