fix: video default audio codec fix (attempt 3)

[nsprenkle]

Description

I found that setting a default audio codec (defaultAudioCodec = "mp4a.40.5") helps reduce issues in HLS streams switching bitrates mid-stream.

After several attempt to set this config (#19 and #21) I found that I needed to set the config much higher up the initialization chain to actually set that value all the places that are used in the level switching process.

Third time's the charm?

Deadline

ASAP but also I probably won't be able to monitor rollout 🤷

[Copilot]

Pull Request Overview

This PR refactors the default audio codec configuration for HLS video playback by moving the defaultAudioCodec setting from the HLS video player constructor to the caller. Instead of setting a default value inside the HLSVideo.Player constructor when not provided, the default value "mp4a.40.5" is now explicitly passed as a configuration parameter when creating the HLS video player instance.

• Removed conditional logic for setting defaultAudioCodec inside the HLS video player constructor
• Added explicit defaultAudioCodec: "mp4a.40.5" parameter when instantiating HTML5HLSVideo.Player

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
xmodule/js/src/video/02_html5_hls_video.js	Removed conditional logic that sets a default audio codec if not provided
xmodule/js/src/video/03_video_player.js	Added explicit defaultAudioCodec parameter with default value when creating HLS video player instance

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