Pie chart duplicates hovered entry after update

Issue description

When hovering over a list entry on the left side of a pie chart window, after the stats next update, the slice of the hovered entry is duplicated in the chart.

(When hovering over a slice, the issue is still visible, albeit it fixes itself after one or a few frames.)

Reproduction steps

1. Open any pie chart window
2. Hover over an entry in the list on the left
3. Wait for the next update of the statistics

Game version and build number

v0.7.5a b453

Operating system

Windows

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