Pie Chart inactive class not set

[frank-bader]

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• [x] bug report - search github for a similar issue or PR before submitting
• [ ] feature request
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Current behavior on hover Pie Chart is not setting class.inactive on other slices.

Expected behavior class.inactive should be set on slices that are not active.

Reproduction of the problem hover over a slice class.active is set, other slices don't have class.inactive set.

What is the motivation / use case for changing the behavior? Fix pie chart slice colors so it's 100% opacity on hover and 20% opacity for inactive slices.

This behavior is implemented in LineChartComponent.

[frank-bader]

PR submitted: https://github.com/swimlane/ngx-charts/pull/1069