derp/derphttp: fix DERP TLS client server name inclusion in URL form

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When dialed with just an URL and no node, the recent proxy fixes caused
a regression where there was no TLS server name being included.

Updates #16222
Updates #16223

Signed-off-by: James Tucker <james@tailscale.com>
Co-Authored-by: Jordan Whited <jwhited@tailscale.com>

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