Upgraded Plyr #2572

Closes #2572 (closed),

Summary

Plyr has put forth an update that should address the volume control going missing for some users.

Removed logic to hide/show volume controls based on audio track detection due to it's problematic nature. If you want to hide volume control, use the controls option to do so.

https://github.com/sampotts/plyr/releases

Steps to test

1. Check video player all working properly
2. Make sure that you can see the volume control on Chrome and Firefox

Estimated Regression Scope

If there's a broken change, that is not in our control. Branch has been officially released.