adapt to new gardio

app.py

@@ -474,7 +474,7 @@ class GUI:
                     )
                     api_key_text = gr.Textbox(label="OPENAI API KEY")
                     organization_text = gr.Textbox(label="Organization")
-                    api_base_text = gr.Textbox(label="OpenAI Base URL", default="", placeholder="if not set, will use openai's default url")
+                    api_base_text = gr.Textbox(label="OpenAI Base URL", placeholder="if not set, will use openai's default url")
                 with gr.Row():
                     with gr.Column():
                         image_output = gr.Image()