get default pos value from array

src/components/DictionaryView.vue

@@ -280,7 +280,7 @@ export default {
       article_key: 0,
       search_results: [],
       lang: 'bm,nn',
-      pos_selected: {label: "Alle ordklasser"},
+      pos_selected: posOptions[0],
       pos: posOptions,
       waiting_for_articles: true,
       waiting_for_metadata: true,