Invalid html generated by the tab code

[vkbo]

The code that generates tabs adds an invalid </input> closing tag. The <input> element in HTML doesn't have a closing tag as it's a void element. I expect they are ignored by browsers anyway, but they fail in HTML validation tools.

https://github.com/executablebooks/sphinx-design/blob/3d0db63f06a8f59a5ea1067e0f43782464eeff83/sphinx_design/tabs.py#L190-L191

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