Fixes VO thread busy looping in paused state for untimed VOs.
One example is vo_lavc (encoding mode), used commonly to extract
thumbnail by scripts.
Example command that was affected:
mpv --ovc=rawvideo --of=image2 --ofopts=update=1 --o=test --pause
file.ext
We have to update request_redraw value to not redraw again. This has
been skipped by early exit before.
This also fixes VO_CAP_NORETAIN case.
Fixes: 8798cec7fa
Kacper Michajłow
903c805a37