Update display value whenever the data prop changes.

[JSONRice]

As the title suggests this pull request addresses the data updates changing the display value since the displayValue is set to an initial value of data[0]

This line:

const [displayValue, setDisplayValue] = useState<DonutItem>(data[0]);

Only get initialized once and never updates so a useEffect is a workaround.

[JSONRice]

@Novsochetra please oh please oh please oh please review and merge. Thank you. 🙏 I really want to use your software but really need this bug resolved. Thank you.

[Novsochetra]

@jasonwr thank for pointing out this section. I will check this PR and merged for the next release.

Thank you 😉😉