icd/nulldrv: Don't leave junk count in Enumerate*LayerProperties
icd/nulldrv: Don't leave junk count in Enumerate*LayerProperties

There are no properties, just write 0 here always.

Signed-off-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>

sashinde/VulkanTools,sashinde/VulkanTools,sashinde/VulkanTools,sashinde/VulkanTools