lnrouter tests: add another channel to graph
lnrouter tests: add another channel to graph

We need another channel to have routes with three hops. This can be
later used to test payment successes.

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