fix: 수업의 회차를 나타내도록 수정

Author: ymkim97

src/main/java/com/tnt/application/pt/PtService.java

@@ -130,7 +130,7 @@ public GetPtLessonsOnDateResponse getPtLessonsOnDate(Long memberId, LocalDate da
 
 			return new Lesson(String.valueOf(ptLesson.getId()),
 				String.valueOf(trainee.getId()), trainee.getMember().getName(),
-				trainee.getMember().getProfileImageUrl(), ptTrainerTrainee.getCurrentPtSession(),
+				trainee.getMember().getProfileImageUrl(), ptLesson.getSession(),
 				ptLesson.getLessonStart(), ptLesson.getLessonEnd(), ptLesson.getIsCompleted());
 		}).toList();