seededit: Align image re-generation to image editing

字节跳动Seedhttps://team.doubao.com/zh/blog/%E4%B8%80%E5%8F%A5%E8%AF%9D%E8%BD%BB%E6%9D%BE-p-%E5%9B%BE-%E5%AD%97%E8%8A%82%E8%B7%B3%E5%8A%A8%E5%9B%BE%E5%83%8F%E7%BC%96%E8%BE%91%E6%A8%A1%E5%9E%8Bseededit%E5%8F%91%E5%B8%83-