paths: set default state path on AIX

Updates #11361

Change-Id: I196727a540be6b7c75303f9958490b1d76189fd6
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