refactor(student): 恢复用户类型选择功能

- 注释掉 userType = 1 的硬编码逻辑
- 恢复使用服务器返回的 userType 值- 删除多余的注释代码

pages/student/login/login.vue

@@ -73,12 +73,11 @@
 						uni.setStorageSync('token', res.data.token);
             let userType = res.data.userType
 
-            userType = 1
+            // userType = 1
 
 						uni.setStorageSync('userType', userType);
 						uni.setStorageSync('tabBerIndex', 0);
 
-						// uni.setStorageSync('userType', res.data.userType);
 						let url_path = ''
 						switch (String(userType)) {
 							case '1': //教练