json 결과 출력 오류 보정

thumbnailImagePaths : 이미지 일 경우만 출력
query-file : 맞지 않음
filePermissionGroups : {} -> String 으로 변경 필요
self : 링크 맞지 않음

``` json
{
"ownerDomainCode": "19103e6354655886cb2f46880a4ae116",
"ownerAuthenticationCode": "41a11f24348d2c513c5f0acac52d3531",
"fileName": "c807567f-337e-4a12-bb2f-6571f4387139.txt",
"fileDownloadUri": "/file-download/c807567f-337e-4a12-bb2f-6571f4387139.txt",
"fileType": "text/plain",
"originFileName": "hello2.txt",
"checkSum": "2819c261f6e1b054e207309808de7c63",
"size": 15,
"filePermissions": [
"owner:write",
"owner:read",
"group:read",
"group:write"
],
"thumbnailImagePaths": [
"/file-download/c807567f-337e-4a12-bb2f-6571f4387139.txt"
],
"filePermissionGroups": [
{
"idAccessCode": "$2a$10$TuKGiVuLJl3xhaVPDNj3EOcjDyKrMcFcc7m.d.PsFX7UjbTgrl1Ju"
},
{
"idAccessCode": "f52fbd32b2b3b86ff88ef6c490628285f482af15ddcb29541f94bcf526a3f6c7"
},
{
"idAccessCode": "fb8c2e2b85ca81eb4350199faddd983cb26af3064614e737ea9f479621cfa57a"
}
],
"_links": {
"query-file": {
"href": "http://localhost:8080"
},
"self": [
{
"href": "http://localhost:8080/file-download/c807567f-337e-4a12-bb2f-6571f4387139.txt"
},
{
"href": "http://localhost:8080/c807567f-337e-4a12-bb2f-6571f4387139.txt"
}
]
}
}
```
파일 정보 표시 오류 보정