lnpeer: fix shutdown: do not broadcast dummy tx
lnpeer: fix shutdown: do not broadcast dummy tx

pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,wakiyamap/electrum-mona,spesmilo/electrum,wakiyamap/electrum-mona,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum