vo_gpu_next: simplify and improve frame redrawing logic

This almost perfectly recreates the semantics of --vo=gpu, i.e.:

- still frames are never interpolated
- non-repeated frames bypass single frame cache

The only difference is that libplacebo doesn't do a cache/blit on the
full output image, but rather it re-runs the last rendering step. This
has some advantages and some drawbacks. The most notable advantage is
that it also allows re-using the image contents when the only thing that
changes is the OSD (whereas `--vo=gpu` would force a full re-render for
that). The most notable drawback is that it also implies going through
the dithering and output LUT logic on redraws. All in all, I think this
is a pretty good trade-off in favor of `--vo=gpu-next`.

Fully fixes the last remaining performance difference in #9430.

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