[Feature Request]: Default Audio quality setting

### Guidelines

- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the feature request I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.
- [X] This issue contains only one feature request.

### Problem Description

I like the default quality option but it's missing an audio version.
I would like to always use the worst audio quality by default and only increase manually if needed.

### Proposed Solution

Add a default audio quality option

### Alternatives Considered

Maybe map the default video quality option to an audio option. Like best video quality selects also the best audio quality by default.
While this is less flexible, it might save on GUI complexity and might be easier to implement.

### Issue Labels

new optional setting

### Additional Information

Currently if no good audio quality is needed, I have to manually select the worst audio manually every time a new video starts.