재생목록 리스트 정렬순서 변경

- 미정렬 -> 생성날짜 내림차순 정렬

src/main/kotlin/kr/co/vividnext/sodalive/content/playlist/AudioContentPlaylistService.kt

@@ -92,7 +92,9 @@ class AudioContentPlaylistService(
     }
 
     fun getPlaylists(member: Member): GetPlaylistsResponse {
-        val playlists = redisRepository.findByMemberId(memberId = member.id!!)
+        val playlists = redisRepository
+            .findByMemberId(memberId = member.id!!)
+            .sortedByDescending { it.createdAt }
 
         return GetPlaylistsResponse(
             totalCount = playlists.size,