small bug that you save negative_text into prompt_keys_to_save['positive_prompt'], so that json file can not save positive prompt correctly

[lemonhall]

https://github.com/audioscavenger/save-image-extended-comfyui/blob/2a2e38397a9d87701f4c8d6caa2cc6a8a4f357ca/save_image_extended.py#L424

            print("执行将positive_text存入prompt_keys_to_save['positive_prompt']")
            prompt_keys_to_save['positive_prompt'] = positive_text
            print("查看一下存入的目标变量是否正确：prompt_keys_to_save['positive_prompt'] ")
            print(prompt_keys_to_save['positive_prompt'])

          if negative_text is not None:
            print("进入了：if negative_text is not None:")
            if isinstance(negative_text, list):
              print("进入了：if isinstance(negative_text, list):")
              if len(negative_text) == 2:
                if isinstance(negative_text[0], str) and len(negative_text[0]) < 6:
                  if isinstance(negative_text[1], (int, float)):
                    continue
            print("执行将negative_text存入prompt_keys_to_save['positive_prompt']")
            **prompt_keys_to_save['negative_text'] = negative_text**

[audioscavenger]

fixed