공통코드 중복체크 API 수정

src/main/java/com/kamco/cd/kamcoback/code/CommonCodeApiController.java

@@ -240,7 +240,7 @@ public class CommonCodeApiController {
   @GetMapping("/check-duplicate")
   public ApiResponseDto<ApiResponseDto.ResponseObj> getCodeCheckDuplicate(
       @io.swagger.v3.oas.annotations.parameters.RequestBody(description = "단건 조회", required = true)
-          @RequestParam
+          @RequestParam(required = false)
           Long parentId,
       @RequestParam String code) {
     return ApiResponseDto.okObject(commonCodeService.getCodeCheckDuplicate(parentId, code));