lib/transform.js determining wrong is_folder, is_file values

[BrianSo]

In lib/transform.js,
At line 124, it uses current_item.type != "folder" to determine whether it is a folder.
But one drive may return a folder with type='album', which makes the program treat that the folder is a file.

I found that one drive always return identifier like this folder.e0de0104ecb2448c.E0DE0104ECB2448C!107.
It means we can use identifier to determine whether it is a folder.

Problems exist on line 62,63,105,106,124 also.

[AnalogJ]

Ahh good catch, I don't use those special folder types so I never noticed. If you want to create a PR I can merge it in, or I should have time to make this fix sometime this week.