IE 11 legend toggle
- Dominant language
- JavaScript
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Description
**Steps to reproduce:**
1. Open any page with c3 chart in IE 11, for example [area chart](https://c3js.org/samples/chart_area.html) or [pie chart](https://c3js.org/samples/chart_pie.html)
2. Try to toggle any item on legend
3. See the chart with hidden item

Or

**Expected result:**
Data should not dissapear from chart.
Maybe it is because IE doesn't support `display: initial` css style and when api.show is called it doesn't remove `display: none` that was added in api.hide
https://github.com/c3js/c3/blob/9f546012615afa9b2c2fb85f36cbe7332cc374f7/src/api.show.js#L13
* **C3 version**: 0.6.7
* **D3 version**: 5.6.0
* **Browser**: IE 11
* **OS**: win10 x64
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