[Matrix] Fix missing DVD menu indicators when using DRM PRIME decoder

[popcornmix]

Backport to Matrix of https://github.com/xbmc/xbmc/pull/21655

Description

Fix for missing DVD menu indicators when using DRM PRIME decoder.

Motivation and context

Fix for https://github.com/xbmc/xbmc/issues/21553 https://github.com/xbmc/xbmc/issues/18898

How has this been tested?

Tested on an RPi3 with "Allow hardware acceleration with DRM PRIME" enabled, and an RPi4 with that setting disabled.

What is the effect on users?

Working DVD menu indicators

Screenshots (if appropriate):

Types of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] Clean up (non-breaking change which removes non-working, unmaintained functionality)
• [ ] Improvement (non-breaking change which improves existing functionality)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that will cause existing functionality to change)
• [ ] Cosmetic change (non-breaking change that doesn't touch code)
• [ ] None of the above (please explain below)

Checklist:

• [ ] My code follows the Code Guidelines of this project
• [ ] My change requires a change to the documentation, either Doxygen or wiki
• [ ] I have updated the documentation accordingly
• [ ] I have read the Contributing document
• [ ] I have added tests to cover my change
• [ ] All new and existing tests passed

[HiassofT]

Thanks a lot, testing on RPi4/LibreELEC looks fine!