layers: Fix var names in CmdClear[C|DS]image
layers: Fix var names in CmdClear[C|DS]image

Change-Id: I3206d734401cb162b219ed9d0a169786a3b5c4c4

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools