Persist video repeat mode + setting

I'd like @Dekans to review this commit as it may have side effects I couldn't think of!

Description

Persist the video playlist repeat type across PlaybackService lifecycle.

Motivation and Context

How Has This Been Tested?

Screenshots / GIFs (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which cleans up / improves existing functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING section of the README document.

Resolves

Fixes: #930 (closed)