Map VIAF (capital letters) to MDNodaRepository::viaf

src/enums/MDNodaRepository.php

@@ -98,6 +98,7 @@ public static function fromString(string $input):MDNodaRepository {
             'ulan'      => self::ulan,
             'ULAN'      => self::ulan,
             'viaf'      => self::viaf,
+            'VIAF'      => self::viaf,
             'wikidata'  => self::wikidata,
             'Wikidata'  => self::wikidata,
             'www.wikidata.org' => self::wikidata,