Candle stick chart not displaying when timestamp used for XAxis.

Hi,

I want to draw a Candle Stick Chart.

The candles are NOT displaying correctly if I use timestamp data for XAxis.
The candles are displaying correctly if I use iteration index for XAxis.

* I have a line chart that is displaying like it should for the same kind of data(timestamp, X value). But when I use those data on candles chart it is not working.

[CandleStickChartNotWorking.txt](https://github.com/danielgindi/Charts/files/3173559/CandleStickChartNotWorking.txt)

Charts (3.2.2)
Swift 4.0
Xcode 10.2.1

Thank you

Start with CandleStickChartNotWorking.txt and reproduce the timestamp-based XAxis case in Charts 3.2.2, comparing it with the iteration-index case and the working line chart. Done means candlestick data renders correctly when timestamps are used for the XAxis, with the reported behavior verified against the attached examples.

Written by the indexing model from the issue text.