core: frontend: App: Fix toolbar height change on disconnect

Use a constant toolbar height to prevent layout shift when the
disconnection message appears.

Closes bluerobotics#3737

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Author: patrickelectric

core/frontend/src/App.vue

@@ -539,7 +539,7 @@ export default Vue.extend({
       return wifi.current_network != null
     },
     toolbar_height(): number {
-      return settings.is_pirate_mode && this.backend_offline ? 66 : 56
+      return 56
     },
     full_page_requested(): boolean {
       return this.$router.currentRoute.query.full_page === 'true'