Resolves#8428
Its currently showing the diff of two branches, even if the PR-unit is disabled. But the POST to create the PR is still returning an error when the unit is disabled, so its only a change for UI.
Preview:
https://codeberg.org/attachments/610d6b81-a50f-4c43-91c2-db4c38e7b701
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8496
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Co-authored-by: zokki <zokki.softwareschmiede@gmail.com>
Co-committed-by: zokki <zokki.softwareschmiede@gmail.com>