zink: use correct number of samples on framebuffer in set_framebuffer_state

state->samples doesn't necessarily reflect the correct value here, so we need
to use the util function

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6263>
1 file changed