Bug 20795: Pass incrreased verbosity to zebra rebuild script

Bug 20795: Pass incrreased verbosity to zebra rebuild script

To test:
1 - Run koha-rebuild-zebra with multiple '-v'
2 - Note no increased verbosity
3 - Apply patch
4 - Run the updated koha-rebuild-zebra script with multiple '-v'
5 - Note increased verbosity

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 1dfb177d3fff713185bcb0aa86517ef40629fedc)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>