Redirect between Issue/PR Number not working if one of both is disabled in Repo Settings

[DrMaxNix]

Description

Normally, if #17 is a Pull Request and you enter .../issues/17 as the url, you will be redirected to .../pulls/17. This, however, does not happen if the issues tab is disabled in the repo settings and produces a "404 Not Found" when visiting .../issues/17. The effect of this is not only that mistyped urls won't be fixed for you, but (and this is much more of a problem) gitea relies on this mechanism internally. When referencing an issue/PR number in a commit message (eg. foo bar baz (fix #17)), gitea will add an anchor to this number on the website, which will always be of the form /{user}/{repo}/issues/{number}, even if the number referenced by the commit message is in fact a PR.

Steps to reproduce:

1. Visit this repo: https://git.tjdev.de/tjdev/dns-watch-2022
2. See the commit message 🩹 get reference list working (#17)
3. Click on the green #17
4. Note how you get a 404 page
5. Now click on the Pull Requests tab
6. See how there actually is a PR with number #17
7. Now if I would enable the issues tab for this repo, step 3 would actually take you to the correct PR page

Gitea Version

1.24.5