Revert "`app.py`: use gallery component"

This reverts commit acc5f49b14fb308f327575ac2bff332b7ddc1c05.

app.py

@@ -96,7 +96,7 @@ def flip_text(prompt, negative_prompt, model, steps, sampler, cfg_scale, width,
 
     job = prodia_client.wait(result)
 
-    return [ job["imageUrl"] ]
+    return job["imageUrl"]
 
 css = """
 #generate {
@@ -166,7 +166,7 @@ with gr.Blocks(css=css) as demo:
 
                 
             with gr.Column(scale=2):
-                image_output = gr.Gallery(value=["https://images.prodia.xyz/8ede1a7c-c0ee-4ded-987d-6ffed35fc477.png"])
+                image_output = gr.Image(value="https://images.prodia.xyz/8ede1a7c-c0ee-4ded-987d-6ffed35fc477.png")
 
         text_button.click(flip_text, inputs=[prompt, negative_prompt, model, steps, sampler, cfg_scale, width, height, seed], outputs=image_output)