fix: "disable router log" indicator on configuration summary page (#10356)

## Summary
Currently, on `{INSTANCE_URL}/admin/config`, the "Disable router log" indicator is completely meaningless, as nothing is assigned to `ctx.Data["DisableRouterLog"]` in [`routers/web/admin/config.go`](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/routers/web/admin/config.go#L121).
This makes the indicator useful without changing any Go code by querying the `Loggers` item that has already been dumped to the context.

Some pictures :)
---

### Before (always)
![image0](/attachments/451c9742-df4b-451a-8144-9d852dcd139f)

### After (with default log config)
![image0](/attachments/451c9742-df4b-451a-8144-9d852dcd139f)

### After (with `LOGGER_ROUTER_MODE` set to empty)
![image](/attachments/df04e085-9a32-402c-8e56-51a311a2a470)

---
## Checklist

The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).

### Tests
As far as I can tell, there aren't tests for TMPL template rendering, if I have overlooked them I'll be happy to add.

- I added test coverage for Go changes...
  - [ ] in their respective `*_test.go` for unit tests.
  - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).

### Documentation

- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.

### Release notes
(I don't really mind)

- [x] I do not want this change to show in the release notes.
- [x] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10356
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: avery <avery@catpowered.net>
Co-committed-by: avery <avery@catpowered.net>

templates/admin/config.tmpl

@@ -20,7 +20,7 @@
 				<dt>{{ctx.Locale.Tr "admin.config.offline_mode"}}</dt>
 				<dd>{{if .OfflineMode}}{{svg "octicon-check"}}{{else}}{{svg "octicon-x"}}{{end}}</dd>
 				<dt>{{ctx.Locale.Tr "admin.config.disable_router_log"}}</dt>
-				<dd>{{if .DisableRouterLog}}{{svg "octicon-check"}}{{else}}{{svg "octicon-x"}}{{end}}</dd>
+				<dd>{{if .Loggers.router.IsEnabled}}{{svg "octicon-x"}}{{else}}{{svg "octicon-check"}}{{end}}</dd>
 
 				<div class="divider"></div>