Swap AND to OR, fix `--log-file` when in system mode.
Easiest PR, ever. :)
Fixes #147
Tried it locally on my OpenWrt router, works exactly as expected.
```
root@FriendlyWrt /s/o/dinit (master)# /etc/init.d/dinit restart
root@FriendlyWrt /s/o/dinit (master)# ls /var/log
caddy.dinit.log caddy.log dinit.log lastlog log.nmbd log.smbd mysql php8-fpm.log rclone samba tor wtmp www.access.log
root@FriendlyWrt /s/o/dinit (master)# tail -f /var/log/dinit.log
dinit: Starting system
dinit: service caddy started.
dinit: service boot started.
^C⏎
root@FriendlyWrt /s/o/dinit (master) [SIGINT]# ps -ef | grep dinit
29095 root 0:00 /sbin/dinit -d /sdcard/dinit.d --log-file /var/log/dinit.log
```