Column cog shows "facet by this" when already default faceted #1469
Description
e.g. on https://covid-19.datasettes.com/covid/economist_excess_deaths
But if you add ?_facet=country to the URL that goes away: https://covid-19.datasettes.com/covid/economist_excess_deaths?_facet_size=5&_facet=country
The logic that decides if the "Facet by this" item is shown does not take default metadata.json facets into account.