Bug#892646: nvidia-nonglvnd-vulkan-common: Vulkan does not work due to incorrect nvidia_icd.json

[Vincas Dargis]

After latest update, I no longer see errors with `vulkaninfo` and 
`vulkan-smoketest`, though for some reason it seems that it's running 
Mesa graphics with `optirun vulkaninfo-smoketest`, not NVIDIA:

```
$ optirun vulkan-smoketest
INTEL-MESA: warning: Haswell Vulkan support is incomplete
frames:519, elapsedms:4344
```