Optimize Menu initialization animation

src/components/menu/menu.vue

@@ -133,9 +133,9 @@
             }
         },
         mounted () {
-            this.updateActiveName();
             this.openedNames = [...this.openNames];
             this.updateOpened();
+            this.$nextTick(() => this.updateActiveName());
             this.$on('on-menu-item-select', (name) => {
                 this.currentActiveName = name;
                 this.$emit('on-select', name);