Fix uninitialized slider due to dynamic import

TODO: Turn sliders into components to avoid such issues

web/typo3conf/ext/ep_theme/Resources/Private/Assets/js/_app.js

@@ -21,6 +21,7 @@ require('leaflet');
 import EventBus from './_bus'
 import SearchBar from './components/SearchBar.vue'
 import SearchBox from './components/SearchBox.vue'
+import ProductDetail from './components/ProductDetail.vue'
 import AjaxContent from './components/AjaxContent.vue'
 import OsmMap from './components/OsmMap.vue'
 import Calendar from './components/Calendar.vue'
@@ -52,7 +53,7 @@ new Vue({
         SearchBar,
         SearchBox,
         SearchResult: () => import('./components/SearchResult.vue'),
-        ProductDetail: () => import('./components/ProductDetail.vue'),
+        ProductDetail,
         AjaxContent,
         OsmMap,
         Calendar,