Reset playlist on new file playback

[a1rwulf]

Suggested fix from @FernetMenta for #16690
@arnova could you test this, I have no PVR setup and have some trouble to trigger your issue.
Thx.

Screenshots (if appropriate):

Types of change

• 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

[arnova]

Yup, fixes the issue. Could you please create a backport PR for Leia as well?

[arnova]

@A1rWolf : Could you add a comment why this is required? Same for backport. Tia!

[a1rwulf]

@arnova Comment added in code and issue mentioned in commit message.

[arnova]

@a1rwulf : Thanks!

[arnova]

UWP build error unrelated