cmd/tsconnect: temporarily switch to xterm.js fork that handles popup windows

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Allows other work to be unblocked while xtermjs/xterm.js#4069 is worked
through.

To enable testing the popup window handling, the standalone app allows
opening of SSH sessions in new windows by holding down the alt key
while pressing the SSH button.

Signed-off-by: Mihai Parparita <mihai@tailscale.com>

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