Remove duplicate tor.streamisolation option
Remove duplicate tor.streamisolation option

This commit removes the duplicate tor.streamisolation option from `sample-lnd.conf` example config file (which was accidentally added in commit #104a9094980f31560ca269d3b01f000dd775778d)
LightningNetwork/lnd,aakselrod/lnd,aakselrod/lnd,LightningNetwork/lnd