[16.0] edi_storage: fix list_files

[simahawk]

TODO: explanation... don't know yet why this is happening for certain SFTP server only.

With detail=False it breaks like this:

>>> fs.ls(fpath.as_posix(), detail=False)
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python3.10/site-packages/fsspec/implementations/dirfs.py", line 255, in ls
    return self._relpath(ret)
  File "/usr/local/lib/python3.10/site-packages/fsspec/implementations/dirfs.py", line 70, in _relpath
    return [self._relpath(_path) for _path in path]
  File "/usr/local/lib/python3.10/site-packages/fsspec/implementations/dirfs.py", line 70, in <listcomp>
    return [self._relpath(_path) for _path in path]
  File "/usr/local/lib/python3.10/site-packages/fsspec/implementations/dirfs.py", line 68, in _relpath
    assert path.startswith(prefix)
AssertionError

[simahawk]

@nilshamerlinck feel free to take over pls :pray:

[github-actions[bot]]

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[simahawk]

@nilshamerlinck ping :)