update how is tx broadcasted

[MarnixCroes]

https://github.com/WalletWasabi/WalletWasabi/pull/13351

it works different now https://docs.wasabiwallet.io/FAQ/FAQ-UseWasabi.html#how-is-the-transaction-broadcast

https://docs.wasabiwallet.io/FAQ/FAQ-UseWasabi.html#why-does-wasabi-choose-a-new-random-node-every-time-i-send-a-transaction