fix(announcement): 修复公告初始化时brandScope默认值问题

src/views/announcement/mixins/announcementIndex.js

@@ -775,7 +775,7 @@ export default {
                     orgCode: this.userInfo?.orgCode || '',
                     orgName: this.userInfo?.orgName || '',
                     visibleRoles: [ROLE_TYPES.DEALER], // 默认经销商
-                    brandScope: { brandIds: [], brandNames: [] },
+                    brandScope: [],
                     customerBlacklist: [],
                     remark: '',
                     status: ANNOUNCEMENT_STATUS.DRAFT