ipn/ipnlocal: actually fill out PeerAPIURLs in PeerStatus

The earlier 5f6d63936f was not complete.

Updates tailscale/corp#7515

Change-Id: I35efca51d1584c48ef6834a7d29cd42d7c943628
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f