fix(zend-mail): drop unused name argument to addBcc method

[faisalahammad]

Summary

PostmanZendMailEngine passes $recipient->getName() as a second argument to Postman_Zend_Mail::addBcc(), but the vendor method signature only accepts $email. PHP 8 raises warnings for excess non-variadic arguments.

Fixes #104

Changes

Postman/Postman-Mail/PostmanZendMailEngine.php

Before:

$mail->addBcc( $recipient->getEmail(), $recipient->getName() );

After:

$mail->addBcc( $recipient->getEmail() );

Why: The Zend vendor addBcc() accepts only $email and internally passes `` for the name when calling _addRecipientAndHeader. The recipient name was already discarded in practice. Removing the second arg eliminate the PHP 8 warning without changing behavior.

Testing

Test 1: Syntax check

1. Run php -l Postman/Postman-Mail/PostmanZendMailEngine.php
   Result: No syntax errors detected.

Test 2: PHP 8 warning regression (WP + PHP 8.1+)

1. Configure a transport in Post SMTP settings
2. Send a test email with Bcc recipients populated
3. Check WP_DEBUG_LOG for any addBcc related warnings
   Result: No warnings logged.

Test 3: Bcc delivery

1. Send a test email with Bcc recipients
2. Verify the email is delivered to Bcc recipients
   Result: Delivery works (same behavior as PHP 7).

Test 4: Cc regression check

1. Send a test email with Cc recipients
2. Verify Cc display names appear in headers
   Result: Cc loop unchanged, names render correctly.