control/controlclient: remove x/net/http2, use net/http

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Saves 352 KB, removing one of our two HTTP/2 implementations linked
into the binary.

Fixes #17305
Updates #15015

Change-Id: I53a04b1f2687dca73c8541949465038b69aa6ade
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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500 Internal Server Error

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