fix: keepAlive not working for popup appendToMain (#5666)

* 修复弹窗和抽屉 `appendToMain` 时且启用`keepAlive` 时未能正确缓存的问题

playground/src/views/examples/drawer/in-content-demo.vue

@@ -1,7 +1,11 @@
 <script lang="ts" setup>
+import { ref } from 'vue';
+
 import { useVbenDrawer } from '@vben/common-ui';
 
-import { message } from 'ant-design-vue';
+import { Input, message } from 'ant-design-vue';
+
+const value = ref('');
 
 const [Drawer, drawerApi] = useVbenDrawer({
   onCancel() {
@@ -17,5 +21,6 @@ const [Drawer, drawerApi] = useVbenDrawer({
   <Drawer append-to-main title="基础抽屉示例" title-tooltip="标题提示内容">
     <template #extra> extra </template>
     本抽屉指定在内容区域打开
+    <Input v-model="value" placeholder="KeepAlive测试" />
   </Drawer>
 </template>