lib/discover: Respect the listen address scheme (fixes #3346)

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This is a supplement patch to commit a58f69b which only fixed global
discovery. This patch adds the missing parts for the local discovery.

If the listen address scheme is set to tcp4:// or tcp6:// and no
explicit host is specified, an address should not be considered if the
source address does not match this scheme.

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

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3380

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