Apply fade to git ignored items in file explorer

[danielwaltz]

Hey @noudadrichem, rather than open an issue for this I figured I'd just fix it myself. Thanks for showing the vscode version some attention, I use it daily and don't see myself switching for a looooong time.

smooches

[danielwaltz]

@noudadrichem Here's what it looks like.

[noudadrichem]

Looks good, we'll update soon!