Remove redundant cleanup of PHPMailer addresses in wp_mail

[bananastalktome]

In the wp_mail() function, ClearAllRecipients(), ClearAddresses(), ClearBCCs(), and ClearCCs() are all called as part of the process of emptying out values set on the $phpmailer object.

Using ClearAllRecipients() should make the other three methods unnecessary, since it already removes all of the recipients (and it doesn't need to loop over anything internally to do so).

This patch removes $phpmailer->ClearAddresses(), $phpmailer->ClearBCCs(), and $phpmailer->ClearCCs().

[SergeyBiryukov]

Looks good to me.

[SergeyBiryukov]

Introduced in [4946].

[SergeyBiryukov]

In 26121:

Remove redundant cleanup of PHPMailer addresses in wp_mail().

props bananastalktome.
fixes #25789.