Systemd permission fix in Linux installer.

ext/installfiles/linux/install.tmpl.sh

@@ -108,6 +108,9 @@ if [ -n "$SYSTEMDUNITDIR" -a -d "$SYSTEMDUNITDIR" ]; then
 	fi
 
 	cp -f /tmp/systemd_zerotier-one.service "$SYSTEMDUNITDIR/zerotier-one.service"
+	chown 0 "$SYSTEMDUNITDIR/zerotier-one.service"
+	chgrp 0 "$SYSTEMDUNITDIR/zerotier-one.service"
+	chmod 0755 "$SYSTEMDUNITDIR/zerotier-one.service"
 	rm -f /tmp/systemd_zerotier-one.service /tmp/init.d_zerotier-one
 
 	systemctl enable zerotier-one