Bug 19303: Move C4::Members::GetFirstValidEmailAddress to Koha::Patron->first_valid_e...

Bug 19303: Move C4::Members::GetFirstValidEmailAddress to Koha::Patron->first_valid_email_address

This new Koha::Patron->first_valid_email_address already exists, it
should be called directly

Test plan:
- With a logged in user who have an email address defined, send a basket.
The email should be marked sent by this email address

- On the "Holds awaiting pickup", the email address must be displayed as well

Signed-off-by: David Bourgault <david.bourgault@inlibro.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>