flatpak: Make the downloads popover work
There's no way to open nautilus now, let alone browse to the file, so give up on that. We'll fall back to Allan's original design when running inside flatpak: nothing happens when clicking on a row, unless you click the open button. Open button opens the file. My inclination is to change this to be the normal behavior outside of flatpak too, but Carlos Garcia likes the browse to file functionality, so let's be conservative for now and change it only when running under flatpak.
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