fix：1、课程合并去掉部分限制

mec-biz/src/main/resources/config/mybatis/StudentMapper.xml

@@ -506,7 +506,7 @@
                     #{studentId}
                 </foreach>
             </if>
-        ORDER BY cssp.user_id_,start_class_time_
+        ORDER BY cssp.user_id_,course_start_time_
     </select>
 
     <select id="getStudentNames" resultType="string">