layers: Fix CB status checks in bindVtx/IndexBuffer
layers: Fix CB status checks in bindVtx/IndexBuffer

These calls were calling the wrong validate function if a CB_NODE
was not found. Fixed this and added appropriate calls to check the
CB recording state.

Change-Id: I8f22f5bca7233fc92b0b91f3aceb8c38b312dc8f

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