panvk: Ignore point size for !points

panvk: Ignore point size for !points

Otherwise wide lines break. The alternative approach is to eliminate the points
writes when not drawing points since we do have topology information at compile
time. I'm admittedly stuck in my GL mindset. That's the approach we'll need for
Valhall anyway.

Fixes dEQP-VK.rasterization.interpolation.basic.lines_wide

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16204>