fix wechat classModel bug

app/service/course/v5/wechat.js

@@ -64,7 +64,7 @@ class WechatService extends Service {
       return false;
     }
     const id = data.Content.replace('在线课程编号:', '');
-    const classInfo = await ctx.classModel.V5.CourseOnlineClass.findOne({ where: { id } });
+    const classInfo = await ctx.classModel.V5.CourseV5Class.findOne({ where: { id } });
     const content = ctx.isEmpty(classInfo) || ctx.isEmpty(classInfo.channel) ? '' : classInfo.channel;
     const token = await this.getAccessToken();
     const url = 'https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=' + token;