Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://elastic.github.io/elastic-charts/?path=/story/legend--hide-legend-items-by-series
2. Toggle either legend knob
3. See no change in the legend items being displayed

Expected behavior
Hidden legend item should not show per #147

Screenshots

Version (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Elastic Charts: [e.g. 1.0.1]

Additional context
Add any other context about the problem here.

Errors in browser console
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Kibana Cross Issues
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Checklist

• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present