Use iso-3166-2-codes if iso-3166-1-codes is not available #377
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In reviewing the discussion at https://community.metabrainz.org/t/possibility-to-tag-by-artist-area-artist-country-of-origin/596808/19 it was discovered that sometimes the country code was returned as iso-3166-2-codes rather than iso-3166-1-codes, and these were not being processed by the plugin. This PR adds the code to process these iso-3166-2-codes if there are no iso-3166-1-codes provided by the api.