install_update_dovecot.sh: fix minor error restarting rsyslog.

install_update_dovecot.sh

@@ -2205,7 +2205,12 @@ EOF
       fatal "Creating file /etc/rsyslog.d/dovecot.conf failed"
    fi
 
-   /etc/init.d/rsyslog restart > /dev/null 2>&1
+   echononl "\tRestart rsyslog Servive"
+   if $systemd_support ; then
+      systemctl restart rsyslog.service > /dev/null 2>&1
+   else
+      /etc/init.d/rsyslog restart > /dev/null 2>&1
+   fi
    if [ "$?" = 0 ]; then
       echo -e "$rc_done"
    else