Use monochrome symbol for directory tree

[jonesbusy]

Before

After

(default)

(dark)

Testing done

Only checking visual

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[basil]

I don't mind approving this if necessary, but I must admit that the new image looks worse than the original one to me. The original one is very clearly a folder with subfolders. I'm not sure what the second image represents. It looks more like the pins of a microprocessor to me and it is not obviously a folder/subfolders at all.

[jonesbusy]

I will try to do an other proposal

[jonesbusy]

Does it look more like subdirectories now ?

[basil]

Thanks for the PR!