fixup! dovecot: Add shared mailbox for the mediation team

roles/dovecot/templates/dovecot.conf.j2

@@ -101,7 +101,7 @@ userdb {
 }
 userdb {
 	driver = passwd-file
-	args = username_format=%{original_user} /etc/dovecot/shared-mailboxes-acl
+	args = username_format=%{original_username} /etc/dovecot/shared-mailboxes-acl
 	# https://doc.dovecot.org/configuration_manual/config_file/config_variables/
 	override_fields = uid=vmail gid=vmail mail=mdbox:~/.mdbox:INDEXPVT=~/indexes/%Ln
 }