util/deephash: relax an annoyingly needy test

I'd added a test case of deephash against a tailcfg.Node to make sure
it worked at all more than anything. We don't care what the exact
bytes are in this test, just that it doesn't fail. So adjust for that.

Then when we make changes to tailcfg.Node and types under it, we don't
need to keep adjusting this test.

Updates #cleanup

Change-Id: Ibf4fa42820aeab8f5292fe65f9f92ffdb0b4407b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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