Fixing a syntax error.

app.py

@@ -494,9 +494,13 @@ with iface:
 
         btn = gr.Button("Submit")
 
+    update_inputs=[]
+    update_inputs.extend(checkbox_groups)
+    update_inputs.append(prompt_display)
+
     btn.click(
         update_prompt_display,
-        inputs=[g for g in checkbox_groups, prompt_display],
+        inputs=update_inputs,
         outputs=[prompt_display],
     ).then(
         selections_to_audio,