types/netmap: delete a copy of views.SliceEqual

Updates #cleanup

Change-Id: Ibdfa6c5dc9211f5c97c763ba323802a1c1d80c9e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f