Bug 17499: (follow-up) Validate phone and itiva transport types

Bug 17499: (follow-up) Validate phone and itiva transport types

Message transport types 'phone' and 'itiva' were not validated unlike
'email' and 'sms'. This patch adds equivalent checks to the missing mtts.

To test:
1. prove t/db_dependent/Koha/Patron/Message/Preferences.t

Sponsored-by: The National Library of Finland
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>