Bug 25752: Stay in cwd after koha-shell

Bug 25752: Stay in cwd after koha-shell

After bug 25538, after a koha-shell we are not longer in the current directory:

root@cec7bffd8100:koha(master)$ pwd
/kohadevbox/koha
root@cec7bffd8100:koha(master)$ sudo koha-shell kohadev
kohadev-koha@cec7bffd8100:~$ pwd
/var/lib/koha/kohadev

Test plan:
Repeat the commands above and confirm that with this version of the
script you get /kohadevbox/koha inside the koha-shell

Search for possible regressions

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>