refactor(general-attribute): 优化 classList 获取方式

pages/component/general-attribute/general-attribute.uvue

@@ -76,8 +76,7 @@ export default {
         this.validateGeneralAttrText = '基础属性 id 验证失败'
         return
       }
-      const classList = generalTarget.ext['classList'] as string[]
-      if (!classList.includes('general-class')) {
+      if (!generalTarget.classList.includes('general-class')) {
         this.validateGeneralAttrText = '基础属性 class 验证失败'
         return
       }