tests: Fix CommandBufferTwoSubmits unexpected error
tests: Fix CommandBufferTwoSubmits unexpected error

Needed some kindo of wait after the submits.

Change-Id: Ib365b3f9f1c6e87fbe4c8da24ee214b9c30d48b3

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers