fix(scatterplot): fix serieId typing

[stuartlong]

serieId is a property on Node.data not Node itself:
From compute.js

export const computePoints = ({ series, formatX, formatY }) => {
    return series.reduce(
        (agg, serie) => [
            ...,
            ...serie.data.map((d, i) => ({
               ...,
                data: {
                    ...,
                    serieId: serie.id
                },
            })),
        ],
        []
    )
}