message: fix use_3steps_large_twd setting
  correct the parameter reading
diff: @@ -648,7 +648,7 @@ def generate_kernel(kernel, precisions, stockham_aot):
  sbrc_transpose_type = launcher.sbrc_transpose_type
  precision = 'dp' if launcher.double_precision else 'sp'
  runtime_compile = kernel.runtime_compile
  - use_3steps_large_twd = getattr(kernel, '3steps', None)
  + use_3steps_large_twd = getattr(kernel, 'use_3steps_large_twd', None)
  block_width = getattr(kernel, 'block_width', 0)
  params = LaunchParams(transforms_per_block, threads_per_block, threads_per_transform, half_lds)
  