Fix the sleep timer in audio mode

Description

When playing audio and the sleep timer intent is received, the playback is stopped.

Motivation and Context

There was a regression and the sleep timer was not working when there was an audio playback

How Has This Been Tested?

Emulator API 28

Screenshots / GIFs (if appropriate):

Irrelevant

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: #833 (closed)