[New/old webdav] HTTP response code differ while getting last share information of deleted share

## Describe the bug

HTTP status code for getting the last share information after deleting the last share is different in old and new WebDAV.

## Steps to reproduce

Steps to reproduce the behavior:

1. create user 'user1' and 'user2'
2. upload folder 'folder1'
3. share folder 'folder1' with 'user2'
4. delete last share with 'user2'
5. get the information of last share
```
curl -u user1:password -X GET https://localhost:9200/ocs/v2.php/apps/files_sharing/api/v1/shares/{shareid} -v
```

## Expected behavior
In both new/old webdav, same HTTP status code
` HTTP/1.1 404 Not Found`

## Actual behavior
In old webdav, ` HTTP/1.1 200 OK`
In new webdav, `HTTP/1.1 404 Not Found`

## Setup

Please describe how you started the server and provide a list of relevant environment variables.

```console
OCIS_VERSION= latest
BRANCH= master
STORAGE_FRONTEND_UPLOAD_DISABLE_TUS=false
```

## Additional context
Add any other context about the problem here.