zip-light-base: Fix permissions of 01su init.d script

The permissions of /system/etc/init.d/01su where set to 06755 by
accident. They should be 0755 instead.
WIP: OTA survival
WIP: OTA survival mode using a tar file
zip-light: Unmount /data
WIP: set metadata on OTA survival script
light: Delete backup files during upgrade

We do not want old backups to remain with the newly upgraded
superuser.zip