Minor typographical changes

app.py

@@ -118,7 +118,6 @@ def generate_for_prompt(input_text, state, ret_scale_factor, max_num_rets, num_w
             filename = save_image_to_local(output)
             response += f'<img src="/file={filename}" style="display: inline-block;">'
 
-    # TODO(jykoh): Persist image inputs.
     chat_history = model_inputs + \
         [' '.join([s for s in model_outputs if type(s) == str]) + '\n']
     # Remove [RET] from outputs.