fix: 메인 홈 - GetAudioContentMainItem

- JsonProperty를 isPointAvailable 수정
- @JsonProperty를 -> @get:JsonProperty, @param:JsonProperty로 수정

src/main/kotlin/kr/co/vividnext/sodalive/content/main/GetAudioContentMainItem.kt

@@ -12,5 +12,7 @@ data class GetAudioContentMainItem @QueryProjection constructor(
     @JsonProperty("creatorNickname") val creatorNickname: String,
     @JsonProperty("price") val price: Int,
     @JsonProperty("duration") val duration: String,
-    @JsonProperty("pointAvailable") val isPointAvailable: Boolean
+    @get:JsonProperty("isPointAvailable")
+    @param:JsonProperty("isPointAvailable")
+    val isPointAvailable: Boolean
 )