Duplicated search results for received shares

## Describe the bug
Received shares always show up as duplicated search results. This is especially bad since it means they can't be properly selected in the web ui.

## Steps to reproduce
1. Shared a file with another user
2. As the share receiver, search for that file via a webdav `REPORT` request:
```
curl 'https://localhost:9200/remote.php/dav/spaces' -u einstein:relativity \
-X 'REPORT' \
--data-raw $'name:"*FILENAME*"'
--insecure
```

## Expected behavior
The file should be listed once in the response.

## Actual behavior
The file is being listed 2 times in the response.