James Valleroy 6b0744c1c7
upgrades: Use only sources file to determine if backports enabled
Tests:
- Build deb and install in buster image. Manually remove backports
  sources file. Security page does not show backports notice. Updates
  page shows button to activate backports.
- Activate backports from updates page. Success message is shown and
  button to activate backports is removed. Security page shows
  backports notice.

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
2020-07-13 14:44:13 -07:00
..
2020-02-19 14:38:55 +02:00
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