fix: AdminService updateCategory 호출 시 누락된 파라미터 추가

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: kangcheolung

src/main/java/com/ongil/backend/domain/admin/service/AdminService.java

@@ -174,7 +174,8 @@ public CategorySimpleResponse updateCategory(Long categoryId, AdminCategoryUpdat
 			request.getName(),
 			request.getIconUrl(),
 			request.getDisplayOrder(),
-			parentCategory
+			parentCategory,
+			null  // sizeChartType은 수정하지 않음
 		);
 
 		return categoryConverter.toSimpleResponse(category);