[YS-311] fix: 성별 무관한 공고에 대해서 남/녀로 필터링했을 때 보이지 않는 현상 해결 (#98)

Author: chock-cho

src/main/kotlin/com/dobby/backend/infrastructure/database/repository/ExperimentPostCustomRepositoryImpl.kt

@@ -104,7 +104,8 @@ class ExperimentPostCustomRepositoryImpl (
     }
 
     private fun genderEq(post: QExperimentPostEntity, gender: GenderType?): BooleanExpression? {
-        return gender?.let { post.targetGroup.genderType.eq(it) }
+        return gender?.let {
+            post.targetGroup.genderType.eq(it).or(post.targetGroup.genderType.eq(GenderType.ALL)) }
     }
 
     private fun ageBetween(post: QExperimentPostEntity, age: Int?): BooleanExpression? {