Improve settings menu on TV demo

[MGaetan89]

Pull request

Description

This PR improves the player settings menu in the TV demo app, and reduce code duplication.

Changes made

• Improve light mode support on TV
• Add the missing "Reset to default" option to audio tracks and subtitles settings
• Add the missing "Disabled" option to audio tracks and subtitles settings
• Reorder settings on TV to match what was done in the mobile demo
• Move the PlayerSettingsViewModel to pillarbox-demo-shared, so it can be used in both demo app. I've also moved a bunch of logic to it (settings definition, settings actions, ...)

Screenshots

Light mode on TV:

The rest of the changes don't impact the UI too much (except the reordering of settings on TV).

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[StaehliJ]

When opening tracks settings in the Mobile demo, it select first disabled and then the one currently selected.

[MGaetan89]

When opening tracks settings in the Mobile demo, it select first disabled and then the one currently selected.

Should be fixed now.

I've also removed the popBackStack() when clicking on a track, so the behaviour is aligned between mobile and TV.