vo_gpu_next: also map pl_bit_encoding for hwdec formats

Needed to fix e.g. yuv422p10le output from Vulkan hwdec (e.g. ProRes
Vulkan decoder).

See-Also: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20852

Author: haasn

video/out/vo_gpu_next.c

@@ -692,6 +692,7 @@ static bool map_frame(pl_gpu gpu, pl_tex *tex, const struct pl_source_frame *src
         frame->acquire = hwdec_acquire;
         frame->release = hwdec_release;
         frame->num_planes = desc.num_planes;
+        frame->repr.bits = plane_bits_from_imgfmt(par.imgfmt);
         for (int n = 0; n < frame->num_planes; n++) {
             struct pl_plane *plane = &frame->planes[n];
             int *map = plane->component_mapping;