Now that WK1 is out of GTK port tree, scripts should all default to WK2 and be cleaned up to remove --webkit-test-runner (-2) config option and all its corresponding checks. For example, 'run-webkit-tests' needs an explicit '-2' flag to run properly but that is meaningless right now. Otherwise, it will try to run DumpRenderTree which is WK1 only and has been removed from GTK port.