logtail: remove unneeded IP redaction code

Updates tailscale/corp#15664

Change-Id: I9523a43860685048548890cf1931ee6cbd60452c
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