live系统将安装路径指定为/boot/doppel/，所以需做对应修改

Log: 在安装了live-system后，备份还原可以正常显示
Change-Id: I05874c37280d4ed7c4557f4a20790292efe3bd86
Reviewed-on: http://gerrit.uniontech.com/c/dde-control-center/+/2695
Reviewed-by: <mailman@uniontech.com>
Reviewed-by: niecheng <niecheng@uniontech.com>
Reviewed-by: fanpengcheng <fanpengcheng@uniontech.com>
Tested-by: <mailman@uniontech.com>