Make the panel fully transparent while in the overview

Merged Jonas Dreßler requested to merge verdre/gnome-shell:overview-transparent-panel into master

The overview is using a heavily darkened background image nowadays. Since the contrast provided by this is always good enough, this makes it possible to always have a fully transparent panel while showing the overview.

So make the panel fully transparent while the overview is shown.

For the focus indicator to look good with this, change that to be a "pill-shaped" background color instead of the line at the bottom of the panel.

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