(to squash) sweepbatcher: make func constructUnsignedTx pure

Author: starius

sweepbatcher/sweep_batch_test.go

@@ -44,7 +44,8 @@ func TestConstructUnsignedTx(t *testing.T) {
 		0x02, 0x19, 0x2d, 0x74, 0xd0, 0xcb, 0x94, 0x34, 0x4c, 0x95,
 		0x69, 0xc2, 0xe7, 0x79, 0x01, 0x57, 0x3d, 0x8d, 0x79, 0x03,
 		0xc3, 0xeb, 0xec, 0x3a, 0x95, 0x77, 0x24, 0x89, 0x5d, 0xca,
-		0x52, 0xc6, 0xb4}
+		0x52, 0xc6, 0xb4,
+	}
 	p2pkAddress, err := btcutil.NewAddressPubKey(
 		serializedPubKey, &chaincfg.RegressionNetParams,
 	)