tu: Fix wrong copies of sampler descriptor.

Found this with the following patch but it exists since adding ycbcr
sampler to the struct.

Fixes: d070a7ba0cfb11f1e01774b9dd3775ab7cd0c4ea

Signed-off-by: Hyunjun Ko <zzoon@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5539>
1 file changed