Revert "[dvdplayer] Allow UpdateCorrection to handle audio and video jumping asynchronously"

This reverts commit 3aca282858cb6795502d2d3521f5b968123dd3df.
[bluray][settings] Add a Blu-ray region setting and use it.
[bluray] Improve still frame handling.
[bluray] Use the region locale (country code) form the settings instead of hardcoded "us".