btcrpc: set channel before sendrawtransaction
btcrpc: set channel before sendrawtransaction

bitcoinj catches funding_tx in block download event.
If block download happen before set channel, fail detect funding_tx.

nayutaco/ptarmigan,nayutaco/ptarmigan,nayutaco/ptarmigan,nayutaco/ptarmigan,nayutaco/ptarmigan,nayutaco/ptarmigan,nayutaco/ptarmigan