fix(course): swap the websocket url to correct one

调整了yweb_socket的websocket地址，将测试地址切换为正式环境地址

src/services/course.ts

@@ -1,8 +1,8 @@
 import axios from './config'
 
 export const API_URL = 'https://pbl.cocorobo.cn/api/pbl/'
-export const yweb_socket = 'wss://yjs.cocorobo.cn'
-// export const yweb_socket = 'wss://yrs.cocorobo.cn'
+// export const yweb_socket = 'wss://yjs.cocorobo.cn'
+export const yweb_socket = 'wss://yrs.cocorobo.cn'
 
 /**
  * 获取课程详情