Revert "MPCVideoDec: fixed playback h264 after "stop" on Intel HD Graphics (force recreate dxva decoder)."

This reverts commit 6d51fc694ab79ea51e530ba7eeab7ea3a548e9a8.

This caused many issues like green screen when starting playback.
Subtitles downloader: Sort by language and then by filename by default.

Fixes #2144.
Make "Sharpen Complex 2" shader compatible with Pixel Shader 2.0.