fjernet en undefined verdi for "level"

src/components/SubArticle.vue

@@ -7,7 +7,7 @@
     </span>
     <ul>
       <DefElement :body="body.intro" v-if="body.intro" @article-click="article_link_click" />
-      <Definition :body="body.article.body.definitions[0]" @article-click="article_link_click" />
+      <Definition :level="9" :body="body.article.body.definitions[0]" @article-click="article_link_click" />
     </ul>
   </li>
 </template>