zink: use sizeof(vec4) multiplier for nir_lower_uniforms_to_ubo

we do everything ubo-related padded out to the size of a vec4, so ensure
that we're getting load offsets using the same alignment

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6981>
2 files changed