JavaScript issue with autocomplete_fields and Semantic UI

Related to issue #100, but slightly different - the latest version may have fixed the bug when Bootstrap is used, but there's a Javascript issue that arises when Semantic is used. I suspect this is due to a namespacing issue with the Select2 widget. When `autocomplete_fields` are defined on a ModelAdmin, the select2 Javascript gets included in the ``. This is the order:

```

... [other stuff]
[at the very bottom]
```

The error I get in console looks like this:
```
Uncaught TypeError: o.find(...).dropdown is not a function
at HTMLDivElement. (martor.semantic.min.js:9:12540)
at Function.each (jquery.js:383:19)
at jQuery.fn.init.each (jquery.js:205:17)
at fn.martor (martor.semantic.min.js:9:344)
at HTMLDocument. (martor.semantic.min.js:9:14373)
at mightThrow (jquery.js:3489:29)
at process (jquery.js:3557:12)
```

Which is triggered by the use of `$().dropdown()` and `$().tab()` in martor.semantic.js:

```js
// Handle tabs.
mainMartor.find('.ui.martor-toolbar .ui.dropdown').dropdown();
mainMartor.find('.ui.tab-martor-menu .item').tab();
```

And here's a screenshot of how it looks:

## Steps to reproduce

To reproduce in the demo app, in settings.py change `MARTOR_THEME = 'bootstrap'` to `MARTOR_THEME = 'semantic'` and then navigate to /admin/app/post/add/. Django version 5.1.4, Martor version 1.6.45, and Chrome 131.0.6778.139.

Possible solutions: to change MARTOR_THEME back to bootstrap (which might work for the demo app, but doesn't really work if I already have Semantic for my project) or to turn off autocomplete. I also tried merely removing the corresponding 2 offending lines from martor.semantic.min.js but it breaks the functionality of the Editor/Preview tabs.

I've also tried installing django-semantic-admin, which seems to automatically turn manytomany fields into Semantic UI dropdown widgets (bypassing select2) without the need to list autocomplete_fields. So far it seems to work, but it would be nice to be able to use Martor and autocomplete_fields together without having to install a different app.

(Thanks for all your work on this @agusmakmun! It's such a useful app.)

Start by reproducing the issue in the demo app at /admin/app/post/add/ after changing MARTOR_THEME in settings.py to 'semantic'. Inspect martor.semantic.js and its minified counterpart around the dropdown and tab initialization, then verify the fix with autocomplete_fields enabled. Done means the Semantic UI editor loads without the dropdown error and its Editor/Preview tabs still work.

Scritto dal modello di indicizzazione a partire dal testo della issue.