Frontend: stop using primevue confirm service

frontend/src/FileManager.vue

@@ -1,14 +1,10 @@
 <template>
-  <ConfirmDialog/>
   <router-view></router-view>
 </template>
 
 <script>
 
-import ConfirmDialog from 'primevue/confirmdialog';
-
 export default {
-  components: { ConfirmDialog },
   data() {
     return {
     };