amis-saas-6522 [Improvement.] 测试：【组件优化第五批】时间轴-外观-样式配置可进行优化；

Change-Id: I7398161b2a96cfb4e695c16e9acf03ee94b664e4

packages/amis-editor/src/plugin/Timeline.tsx

@@ -102,18 +102,9 @@ export class TimelinePlugin extends BasePlugin {
       {
         title: '外观',
         body: getSchemaTpl('collapseGroup', [
-          {
-            title: '样式',
-            body: [
-              {
-                name: 'className',
-                label: '外层',
-                type: 'input-text',
-                placeholder: '请输入className'
-              },
-
-            ]
-          }
+          getSchemaTpl('style:classNames', {
+            isFormItem: false
+          })
         ])
       },
       {