System account to support RoundCube SSO

Version 1.592

Feature
Finished

The one_click_webmail_login feature previously only support virtual accounts in the /etc/virtual/domain.com/passwd files. The system account was not in there, it's in /etc/passwd, so the passwd_alt method used by dovecot as a backup login file didn't work. The system_user_to_virtual_passwd=1 feature lets you store the system account in the virtual passwd file. https://www.directadmin.com/features.php?id=2164 This change simply accepts the system account, when creating the login token. No other changes were needed, aside from making the system account name clickable on the CMD_EMAIL_POP?domain=domain.com page. ---- T20698

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