fix: word

app/service/course/v4/online.js

@@ -22,7 +22,7 @@ class OnlineService extends Service {
     let type = await ctx.classModel.V4.CourseOnlineType.findAll({ where: { status: 'online', is_deleted: 0 }, attributes: [ 'id', 'name' ], raw: true });
     type = [{ id: 0, name: '全部' }].concat(type);
     // 课程类型
-    const price_type = [{ id: 0, name: '全部' }, { id: 2, name: '公益免费课' }, { id: 1, name: '低价体验课' }, { id: 3, name: '正价课' }];
+    const price_type = [{ id: 0, name: '全部' }, { id: 2, name: '免费公益课' }, { id: 1, name: '低价体验课' }, { id: 3, name: '正价课' }];
 
     const options = {
       cats,