Make the path table record extent the same as the dirrecord.
Make the path table record extent the same as the dirrecord.

Since we have that information now, we can keep it up
to date.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

clalancette/pycdlib,clalancette/pyiso