fix: 全部展开收起的button样式错乱问题

src/views/system/menu/menu.vue

@@ -20,7 +20,7 @@
                   </template>
                 </el-button>
 
-                <el-button type="primary" plain icon-placement="left" @click="packHandle">
+                <el-button type="primary" icon-placement="left" @click="packHandle">
                   全部{{ expandedKeys.length ? '收起' : '展开' }}
                   <template #icon>
                     <div class="flex items-center">