control/controlhttp: use ws:// when HTTPSPort is NoPort in JS dialer

When HTTPS is explicitly disabled (HTTPSPort == NoPort), the JS WebSocket
dialer should use ws:// instead of wss://. This matches the behavior of
the non-JS client and fixes connections to development control servers
e.g. http://localhost:31544.

Updates tailscale/corp#40944

Signed-off-by: Adriano Sela Aviles <adriano@tailscale.com>
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