Fix playback termination when launched from driving mode

Description

This MR resolves Google Maps driving mode terminating VLC within 10 seconds after launch. Several small clean-ups are also included.

Motivation and Context

See #2248 (closed)

How Has This Been Tested?

Tested on a Pixel 3 running Android 11

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

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

Resolves

Fixes: #2248 (closed)