wallet: (perf) avoid iterating over all invoices in add_transaction
wallet: (perf) avoid iterating over all invoices in add_transaction

spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc