Revert "archives: Use https link for the PPAs"

[danirabbit]

Reverts elementary/os#641

Seems like builds haven't completed since this was merged

[tintou]

I re-triggered the last daily and it worked so it's probably a hiccup from the CI or the mirrors (the daily was using mirrors in America and my new try was using mirrors in Europe if that might be a thing)

[davidmhewitt]

Indeed. We've always had regular failures due to timeouts after 6 hours.

I believe it's related to using the Ubuntu mirror list instead of an actual stable mirror. Some of the mirrors in the list are terrible.

See #636

[danirabbit]

Never mind then 😅