Use appSubUrl for OAuth2 callback URL tip (#28266) (#28275)
Backport #28266 by @earl-warren
- When crafting the OAuth2 callbackURL take into account `appSubUrl`,
which is quite safe given that its strictly formatted.
- No integration testing as this is all done in Javascript.
- Resolves https://codeberg.org/forgejo/forgejo/issues/1795
(cherry picked from commit 27cb6b7956)
Co-authored-by: Earl Warren <109468362+earl-warren@users.noreply.github.com>
Co-authored-by: Gusted <postmaster@gusted.xyz>
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