Trimming the first character in the directory name when integrating into CKEditor5

[besnovatyj]

Integration into CKEditor5 using https://github.com/Studio-42/elFinder/wiki/Integration-with-CKEditor-5.

The hash is generated using https://github.com/Studio-42/elFinder/issues/1564#issuecomment-237479979

If you pass not only the volumeId, but also an additional path to the directory, then the first character in the path to the directory is cut off in line 3334.

https://github.com/Studio-42/elFinder/blob/66f497515ab2a3e867648cfb410089d1a8d6d53f/php/elFinderVolumeDriver.class.php#L3334

---

Initial data:

$uploadTargetPath = 'documents_module';
$volumeId = 'fls1_';
$fileName = 'yadisk-3.jpg';
$hash = 'fls1_ZG9jdW1lbnRzX21vZHVsZS95YWRpc2stMy5qcGc';

Expected value: documents_module/yadisk-3.jpg The resulting value: ocuments_module/yadisk-3.jpg

---

As a result, the script returns an incorrect URL to the locally downloaded file.

 fm.exec('upload', {files: [file], target: uploadTargetHash}, void(0), uploadTargetHash)
                                .done(data => {
                                    if (data.added && data.added.length) {

In the code above, data.added contains an invalid URL to the file.