[FIX] chart: trend line legend is wrong #5226
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Description
The trend line legend is a circle instead of a line in scatter charts. And it's a rectangle in bar chart.
Also the onClick of the legend was slightly wrong: we used the index of the legend item to check which dataset to hide. Which didn't work if for whatever reason ChartJs decided to change the order of the legend items.
Task: 4342471
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