Remove new line from ChangePasswordResetForm message

Problem/Motivation

The message with expiration date in ChangePasswordResetForm::buildForm() contains a new line.

<p>This is a one-time login for %user_name and will expire on 
%expiration_date.</p><p>Click on this button to log in to the site and change your password.</p>

The same message in UserPasswordResetForm::buildForm() does not contain a new line.

It leads to missing translation in other languages https://ftp.drupal.org/files/translations/all/change_pwd_page/

Proposed resolution

Remove the new line \n in ChangePasswordResetForm class.