layers: Fix mismatched new[] / delete
layers: Fix mismatched new[] / delete

Likely benign on anything reasonable, but still UB.

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