[web] Remove useless app div element

web-src/src/App.vue

@@ -1,5 +1,4 @@
 <template>
-  <div id="app">
   <navbar-top />
   <vue-progress-bar class="has-background-info" />
   <router-view v-slot="{ Component }">
@@ -20,7 +19,6 @@
     class="overlay-fullscreen"
     @click="show_burger_menu = show_player_menu = false"
   />
-  </div>
 </template>
 
 <script>