emulators/wine-devel: Merge the VULKAN option into VKD3D

When Wine gained support for the Vulkan API and D3D support via
Vulkan we added two options (both off by default): VULKAN and
VKD3D.

Simplify things, in particular also from a user perspective, by only
keeping the VKD3D option which now subsumes the former VULKAN option
(and hence Vulkan API support).

No change in defaults - yet.

On the way adjust CONFIGURE_ARGS to only feature on option per line,
which was mostly the case already anyway.

PR: 258375