Return-Path Email is not used

[weierophinney]

Description

E-mail Return-Path is not set correctly because it only uses the last forced e-mail address, so as workaround I implemented this code change to give priority to the e-mail address that is already stored in the parameters and therefore the return path mail will be set correctly.

E.g. $parameters = " '-f test1@mail.com' '-f test2@mail.com'";
It will use 'test2@mail.com' as return path email.

Magento 2.3.0 Alpha: steps to reproduce

 1 - Admin store: Stores > Settings > Configuration > Advanced > System > Mail Sending Settings > Return-Path Email - set a different return path email
 2 - Place an order
 3 - Look for ´Return-Path: <new return path email>' in the email

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Originally posted by @Filipe-Bicho at zendframework/zend-mail#215