peekViewEditor background doesn't match editor background

[marcelotedeschi]

Hi there! First of all, this is my favorite theme, great job, I love it :)

One thing I would love to have as a default, is the background of the peekViewEditor to match the base editor background. Right now my feeling is it doesn't really match, so I wonder if that is currently on purpose or can be an improvement! I'm now setting it manually, but when I'm switching to light themes on bright days (yes, yes, don't judge me haha), the peak editor has a dark background 😞 .

I'd be happy to push a PR if needed.

Thanks