demos: Unify capitlization in json output
demos: Unify capitlization in json output

Change-Id: Ie74c686af656e346789b30ec1aba41457170c6d2

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