Update TicketService.php

[serjsv87]

If a client replied via email, and there is a <base ...> tag in the email, then in the end all links are taken starting from this tag and it is impossible to reply.

1. Why is this change necessary?

In some cases, it causes a problem

2. What does this change do, exactly?

Fixes this problem )

3. Please link to the relevant issues (if any).