tsweb: add FQDN to Port80Handler to allow HTTPS redirects

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When the request comes in say over http://mon, the current
implementation would rewrite it https://mon which causes the cert
validation to fail. This PR keeps the existing behavior intact but also
allows passing in a FQDN to the handler to reroute to the correct
hostname.

Related to https://github.com/tailscale/tailscale/pull/4208#pullrequestreview-913832340

Signed-off-by: Maisem Ali <maisem@tailscale.com>

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