frontend: Add logging for not default audio tracks

[exeldro]

Description

Add logging for not default audio tracks

Motivation and Context

Want to be able to diagnose audio issues from the OBS log file
example:

10:50:33.820: - scene 'Scene':
10:50:33.820:     - source: 'Video Capture Device' (dshow_input)
10:50:33.821:         - audio tracks: 1 2 4 5 6

How Has This Been Tested?

On windows by having sources in the advanced audio properties set to none tracks and some tracks

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.