cmd/discosrv: Respect the listen address scheme (fixes #3346)

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If the listen address scheme is set to tcp4:// or tcp6://, it needs to be
made sure that the remote address matches this scheme before it is added to
the database.

This prevents invalid URIs like tcp4://<IPv6 address>:<port> or tcp6://<IPv4
address>:<port>.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3378

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