fix path name

dist/etc/systemd/system/digd.js.service

@@ -19,7 +19,7 @@ Group=digd
 
 WorkingDirectory=/opt/digd.js
 # TODO use --config instead of commandline params
-ExecStart=/opt/digd.js/bin/node /opt/digd/bin/digd.js --port 53 --input /srv/digd.js/db.json +norecurse
+ExecStart=/opt/digd.js/bin/node /opt/digd.js/bin/digd.js --port 53 --input /srv/digd.js/db.json +norecurse
 ExecReload=/bin/kill -USR1 $MAINPID
 
 # Limit the number of file descriptors and processes; see `man systemd.exec` for more limit settings.