[settings] Only need a confirmation dialogue when resolution has changed

This fixes a bug when every time video output settings page is opened it asks if you would like to keep this change
Revert "paplayer: use position based seeks for ffmpeg demuxer"

This reverts commit fdcb40a9c2817d87a661a7cb7d72808e0f09ffed.
Merge pull request #4498 from popcornmix/reschange

[settings] Only need a confirmation dialogue when resolution has changed
Merge pull request #4500 from FernetMenta/aefixes

Revert "paplayer: use position based seeks for ffmpeg demuxer"