Allow hiding of all filters in a category
Allow hiding of all filters in a category

Expands the functionality of the sidebar filter badges to allow inactivation of all (active) filters in a category.

The choice was made to keep a sidebar badge "active" if any of its constituent filters was active. For example, if there were a mixture of 3 active and 2 inactive country filters (displayed at the top of the page), then the sidebar badge will be active and show "3 x country", with the option to inactivate those 3 filters, or remove all 5.

Closes https://github.com/nextstrain/auspice/issues/1358
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