config: default autopilot min confs to 1

This prevents spending unconfirmed funds by default. Users will have to
explicitly set this to 0 in order to do so.

config.go

@@ -391,6 +391,7 @@ func loadConfig() (*config, error) {
 			Allocation:     0.6,
 			MinChannelSize: int64(minChanFundingSize),
 			MaxChannelSize: int64(MaxFundingAmount),
+			MinConfs:       1,
 			ConfTarget:     autopilot.DefaultConfTarget,
 			Heuristic: map[string]float64{
 				"preferential": 1.0,