File2: fixed download triggering twice

vispa/extensions/file2/static/html/vue/detailItem.html

@@ -29,7 +29,7 @@
   </renamer>
   <div class="actions">
     <a @click="action('rename', {event: $event})"><i class="fa fa-pencil"></i><span>Rename</span></a>
-    <a @click="action('download', {event: $event})" :href="downloadLink" :download="data.name" target="_blank" v-el:download><i class="fa fa-download"></i><span>Download</span></a>
+    <a @click.prevent="action('download', {event: $event})" :href="downloadLink" :download="data.name" target="_blank" v-el:download><i class="fa fa-download"></i><span>Download</span></a>
     <a @click="action('remove', {event: $event})"><i class="fa fa-trash"></i><span>Remove</span></a>
   </div>
   <div