vulkan/wsi: keep allocate queue families in image, just don't fill them

vulkan/wsi: keep allocate queue families in image, just don't fill them

This changes the code so that it only looks at the passed in families
when concurrent, otherwise it always allocates one.

Fixes: 48b3ef625e19 ("vulkan/wsi: handle queue families properly for non-concurrent sharing mode.")
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Acked-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Tested-by: Mike Lothian <mike@fireburn.co.uk>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15331>