Multiline chart show only one line chart when x values of datasets are different

* [x ] I've read, understood, and done my best to follow the [*CONTRIBUTING guidelines](https://github.com/jjatie/Charts/blob/master/CONTRIBUTING.md).

## What did you do?

I was adding a multiline chart to my app using `LineChartView`, the same code as example code in `LineChart2ViewController`. The only different thing from the example is datasets has different x values.

## What did you expect to happen?

The chart show multilines with different x values.

## What happened instead?

Only one line showed, the other lines just show dots. You can reproduce it by update line 96 in the file LineChart2ViewController.swift in the example project, change to `i + 1` from `i`.
`return ChartDataEntry(x: Double(i + 1), y: val)`

## Charts Environment

**Charts version/Branch/Commit Number:** 4.0.3/master/b38b8d45a8cbda9f0f2a3566778ed114f06056b7
**Xcode version:** 13.2.1
**Swift version:** 5.5.2
**Platform(s) running Charts:** iOS
**macOS version running Xcode:** 11.5.2

## Demo Project

The demo project is the example project of this library. The only thing I changed is **line 96 in the file LineChart2ViewController.swift**, to make x value of data set 1 different to the other two data sets. Please build the project, tap Line Chart (Dual YAxis) to see the problem.
https://drive.google.com/file/d/1AX-0QbQt8ro_joP2iiDGPksXaWA-l4JI/view?usp=sharing

## Screenshots
What I expected:
What it happened:
What I did: