Allow LaTeX rendering in org mode files

### ⚠️ This issue respects the following points: ⚠️

- [x] This is a **enhancement/feature request**. Not a [bug or question](https://github.com/gsantner/markor/issues/new/choose).
- [x] The topic is **not** already reported at [Issues](https://github.com/gsantner/markor/issues?q=#js-issues-search). _(I've searched it and checked most recent issues)_.
- [x] Markor **is** up to date. See [Releases](https://github.com/gsantner/markor/tags) for the latest version. Updates are available from [F-Droid](https://f-droid.org/en/packages/net.gsantner.markor/) and GitHub.
- [x] The wanted feature/enhancement is not present in the latest development version (git master). (Please [download](https://nightly.link/gsantner/markor/workflows/build-android-project/master) and try the test version of Markor, named **Marder**. Don't worry; Markor and Marder appear as completely separate applications. You can install both side-by-side, and Markor's settings are not touched. If your desired feature is present, you don't need to open this issue. The change will be part of the next Markor update.)

### Description

In Settings > Markdown: I can enable "Math" view mode to render LaTeX in-between dollar signs for markdown files, but I can't see this setting inside OrgMode format. Is it possible to add it there as well?

### Information

Android version:
Device (phone model):
App Version: Latest

### Source

F-Droid

### Format / File type

Something else (-> Additional info)

### Additional info / Log

```shell
- File type: OrgMode
```

Start at Settings > Markdown and compare the existing Math view mode behavior with the OrgMode format; the issue identifies OrgMode files and LaTeX between dollar signs as the entry point. Done means OrgMode offers the same Math setting and renders matching LaTeX expressions, with the relevant behavior verified in the app.

Written by the indexing model from the issue text.