Re-add LogFormat to Config

cmd/ethereum/main.go

@@ -67,6 +67,7 @@ func main() {
 		DataDir:   Datadir,
 		LogFile:   LogFile,
 		LogLevel:  LogLevel,
+		LogFormat: LogFormat,
 		MaxPeers:  MaxPeer,
 		Port:      OutboundPort,
 		NAT:       NAT,