Fix spacing between horizontal legend and x-axis #3038
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The position of horizontal legend is incorrect because the height of X-axis is added twice.
When X-axis labels were rotated, large space will appear above the legend like this:
This commit fixes the issue.
The legend will be displayed too close to X-axis labels, but it would be another issue.
It seems that no property specifies spacing between the legend and axis.
In LegendRenderer#renderLegend(), yOffset of Legend is used as the margin from the outer edge of the chart.