fix: region 고정된 값이 들어가는 문제 수정

Author: leebs0521

src/main/java/com/somemore/recruitboard/dto/request/RecruitBoardCreateRequestDto.java

@@ -46,7 +46,7 @@ public record RecruitBoardCreateRequestDto(
 
     public RecruitBoard toEntity(UUID centerId, Long locationId, String imgUrl) {
         VolunteerInfo volunteerInfo = VolunteerInfo.builder()
-            .region("경기")
+            .region(region)
             .recruitmentCount(recruitmentCount)
             .volunteerStartDateTime(volunteerStartDateTime)
             .volunteerEndDateTime(volunteerEndDateTime)