Bug 36008: Use notice_email_address instead of email for SendAlerts issue type

This change makes Koha use "notice_email_address" instead of "email" for
SendAlerts with a type of "issue". This brings SendAlerts more in line with
the rest of Koha

Test plan:
0. Apply the patch
1. Create a subscription
- Go to http://localhost:8081/cgi-bin/koha/serials/serials-home.pl
- Click "New subscription" and follow the prompts / fill out
required fields
- On the first screen, ensure "Patron notification" says "New serial issue"
(You can edit this after creating the subscription if necessary)
2. Click "subscribers" next to "Patron notification: SERIAL_ALERT"
3. Log into the OPAC, go to the bib record for that subscription, click "Subscriptions",
and click "Subscribe to email notification on new issues" and click "Yes" on the subsequent
screen
4. Edit your patron record and make sure you have an email in "Secondary email" and not "Primary email"
5. Set up a SMTP server for your Koha or some other email delivery mechanism
6. Go to the "Serial collection" for your subscription
e.g. http://localhost:8081/cgi-bin/koha/serials/serials-collection.pl?subscriptionid=1
7. Click "Receive"
8. Mark the serial as "Arrived"
9. Click "Save"
10. Note that you receive an email using your Koha user's "Secondary Email" address

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

C4/Letters.pm

@@ -308,7 +308,7 @@ sub SendAlerts {
         my $subscription = Koha::Subscriptions->find( $subscriptionid );
         my $subscribers = $subscription->subscribers;
         while ( my $patron = $subscribers->next ) {
-            my $email = $patron->email or next;
+            my $email = $patron->notice_email_address or next;
 
 #                    warn "sending issues...";
             my $userenv = C4::Context->userenv;