refactor(alertModal): 移除未使用的vue导入

移除defineProps, defineEmits和withDefaults等导入，vue3.2+之后就是编译器宏不需要手动导入。

src/layout/components/alertModal/index.vue

@@ -45,7 +45,7 @@
 </template>
 
 <script setup lang="ts">
-import { defineProps, defineEmits, withDefaults, ref } from 'vue'
+import { ref } from 'vue'
 import { WarningOutlined } from '@ant-design/icons-vue'
 import * as eventAPI from '@/api/event'
 import { message } from 'ant-design-vue'