Replace magic constants for seek() calls in perl scripts

Replace magic constants for seek() calls in perl scripts

A couple of tests have been using 0 as magic constant while SEEK_SET can
be used instead.  This makes the code easier to understand, and more
consistent with the changes done in 3c5b068.

Per discussion with Andrew Dunstan.

Discussion: https://postgr.es/m/YHrc24AgJQ6tQ1q0@paquier.xyz