Php error while trying to download file related to setcookie()

```
setcookie(): "path" option cannot contain ",", ";", " ", "\t", "\r", "\n", "\013", or "\014" (Error Code: 0)
vendor/studio-42/elfinder/php/elFinder.class.php (2085)
```

This is the same as issue #3538 
It was fixed by #3561 
Then the change was reverted in #3619 
I'm not sure about the problem fixed by #3619, as there's no related issue or explanation on the change.
