rpc: don't count pending channels in total channel balance

rpcserver.go

@@ -776,8 +776,10 @@ func (r *rpcServer) ChannelBalance(ctx context.Context,
 
 	var balance btcutil.Amount
 	for _, channel := range channels {
+		if !channel.IsPending {
 			balance += channel.OurBalance
 		}
+	}
 
 	return &lnrpc.ChannelBalanceResponse{Balance: int64(balance)}, nil
 }