LGTM.com - false positive: "Duplicate HTML element attributes" caused by valid Django template tags

**Description of the false positive**

```html
{% csrf_token %}
```
This is valid Django template HTML with no duplicate attributes, however LGTM reports it as having duplicate tags due to it seeing `{%` and `%}` appear multiple times in a single opening tag.

**URL to the alert on the project page on LGTM.com**

https://lgtm.com/projects/g/ArchiveBox/ArchiveBox/snapshot/665e2817780d54eb2e1540fd80e48aeef9950775/files/archivebox/templates/admin/private_index_grid.html#L61


**Possibly related PRs/Issues:**

- https://github.com/github/codeql/pull/5236
- https://github.com/github/codeql/issues/5224