Add abilty to remove color from tasks icons of non current workspace

[m-ar-c]

I think it is very hard to see at a glance what is the current workspace. The tasks icons and the workspace numbers are slightly less bright but it is still very hard for me to figure that out.

Browsing the settings I saw a "Remove color from tasks icons"... It made me think it would be great to have a "Remove color from tasks icons from non current workspace." (maybe it wouldn't be hard to implement since the mechanism to remove color already exist ?) !

That way it would be much more easy to see instantly what is the current desktop, less work for the brain 🎉.