Bug: Excluded categories for forum widget not working

**Describe the bug**
Some categories which are in EXCLUDED_CATEGORIES are not excluded.
Example : 23/03/22 13h55

```
https://forum.camptocamp.org/t/cherche-partenaire-alpi-4000m/295879

const EXCLUDED_CATEGORIES = [
// https://forum.camptocamp.org/c/comments
// document's comments
29,
[...]
// https://forum.camptocamp.org/c/partenaires/partenaires-alpinisme-cascade-de-glace
// mountaineering buddy finder
113,
```

I found this because I'm working on a widget which would show only "not mountaineering" categories (Site and Association, contributeurs...), but whatever changes I've done on the constant EXCLUDED_CATEGORIES, it stay still.

**Reproduce**
On local server, delete all categories in the constant EXCLUDED_CATEGORIES, this change nothing on the result.

Start by locating the forum widget and its EXCLUDED_CATEGORIES constant, then reproduce the issue on a local server with the constant emptied. Trace where category data is filtered and verify that changing the constant changes the widget result.

Written by the indexing model from the issue text.