initramfs/newroot/liram: fixup

* liram_write_env(): write LIRAM_SLOT as LIRAM_BOOTED_SLOT
* liram_unpack_default(): unpack "<a>-<b>","<a>_<b>" into "<a>/<b>"
scripts/liram/pack_tv: etc_update
scripts/liram/liram-manage: LIRAM_HARDLINK_CORE