derp/derphttp: make CONNECT Host match request-target's authority-form

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This CONNECT client doesn't match what Go's net/http.Transport does
(making the two values match).  This makes it match.

This is all pretty unspecified but most clients & doc examples show
these matching. And some proxy implementations (such as Zscaler) care.

Updates tailscale/corp#18716

Change-Id: I135c5facbbcec9276faa772facbde1bb0feb2d26
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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