layers: Fix var names for ClearImageLayout funcs
layers: Fix var names for ClearImageLayout funcs

Change-Id: I66c42d591d70b816788cb1ab457d8d674fb5cbe5

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