시리즈 콘텐츠 정렬

- defaultValue 대신 required = false로 수정

src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt

@@ -50,7 +50,7 @@ class ContentSeriesController(private val service: ContentSeriesService) {
     @GetMapping("/{id}/content")
     fun getSeriesContentList(
         @PathVariable id: Long,
-        @RequestParam("sortType", defaultValue = "NEWEST") sortType: SeriesSortType,
+        @RequestParam("sortType", required = false) sortType: SeriesSortType? = SeriesSortType.NEWEST,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {
@@ -60,7 +60,7 @@ class ContentSeriesController(private val service: ContentSeriesService) {
             service.getSeriesContentList(
                 seriesId = id,
                 member = member,
-                sortType = sortType,
+                sortType = sortType ?: SeriesSortType.NEWEST,
                 offset = pageable.offset,
                 limit = pageable.pageSize.toLong()
             )