Directories identified as files in walk()

[dfigus]

I'm running adlfs==0.2.4 & fsspec==0.6.2 and observed the following behavior:

Given the folllowing folder structure in ADLS Gen1:

/folder/subfolder1/subfolder1_1
/folder/subfolder1/subfolder1_2
...

If I do a

_, directories, files = next(fs.walk('/folder'))

I get subfolder1 in files and not directories. I did a short debugging and it looks like that the official Microsoft AzureDLFileSystem.ls() returns "type" = "DIRECTORY", but in fsspec's AbstractFileSystem.walk() "type" = "directory" is expected. Therefore all folders are treated as files.

[hayesgb]

Fixed on PR.