Material-theme-jetbrains: option to change the excluded directories background color

[jimmymain]

Summary

The background color of the excluded folders does not seem to be customisable at the moment.
This is possibly mostly relevant to the dark themes.

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Expected behavior

Expect to be able to specify the foreground and background color of these folders somwhere.
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Actual behavior

The color is fixed.
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[mallowigi]

Settings > Appearance > File Colors