直播课详情，增加教师头像返回

cooleshow-user/user-biz/src/main/java/com/yonge/cooleshow/biz/dal/service/impl/CourseGroupServiceImpl.java

@@ -123,6 +123,7 @@ public class CourseGroupServiceImpl extends ServiceImpl<CourseGroupDao, CourseGr
                 .ifPresent(sysUser -> {
                     result.setTeacherName(sysUser.getRealName());
                     result.setUserName(sysUser.getUsername());
+                    result.setAvatar(sysUser.getAvatar());
                 });
         Optional.ofNullable(group.getSubjectId()).map(subjectService::get)
                 .ifPresent(subject -> result.setSubjectName(subject.getName()));