Update script to install Haveno seed node as a system service
This issue requests updating the script to install a Haveno seed node as a system service, [install_seednode_debian.sh](https://github.com/haveno-dex/haveno/blob/master/seednode/install_seednode_debian.sh).

Currently it points to Bisq's repo and Bitcoin binaries.

A related issue is to update the seed node from Bisq: https://github.com/haveno-dex/haveno/issues/649