scripts: uncomment the previous stages

Leftover.
rewrite_ifo: Make mkisofs slight happier

The VIDEO_TS.BUP looks still weird as it looks weird how it is
calculating that offset.
rewrite_ifo: Patch the title offsets as well

It is used by mkisofs to compute some offsets, now vanilla mkisofs
can build images (but apparently something is still wrong).
rewrite_ifo: Remove few typos