fix: 学生端我购买的课程vip课上课模式错误

mec-biz/src/main/java/com/ym/mec/biz/service/impl/ClassGroupServiceImpl.java

@@ -1189,7 +1189,7 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
             if (teacherClassGroupDto.getType() == ClassGroupTypeEnum.VIP) {
                 String[] studentNums = classGroupStudentMapperDao.findStudentNumByClassGroupId(teacherClassGroupDto.getClassGroupId());
                 teacherClassGroupDto.setStudentNames(StringUtils.join(studentNums, ","));
-                if (teacherClassGroupDto.getOffLineClassesNum() > 0 && teacherClassGroupDto.getOffLineClassesNum() <= 0) {
+                if (teacherClassGroupDto.getOnlineClassesNum() > 0 && teacherClassGroupDto.getOffLineClassesNum() <= 0) {
                     teacherClassGroupDto.setClassMode(1);
                 } else if (teacherClassGroupDto.getOnlineClassesNum() > 0 && teacherClassGroupDto.getOffLineClassesNum() > 0) {
                     teacherClassGroupDto.setClassMode(3);