message: Fix dr.make_opaque for diff TensorXf
diff: @@ -4975,10 +4975,10 @@ def make_opaque(*args):
  if _dr.depth_v(t) > 1:
  for i in range(len(a)):
  make_opaque(a.entry_ref_(i))
  - elif _dr.is_diff_v(t):
  - make_opaque(a.detach_ref_())
  elif _dr.is_tensor_v(t):
  make_opaque(a.array)
  + elif _dr.is_diff_v(t):
  + make_opaque(a.detach_ref_())
  elif _dr.is_jit_v(t):
  if not a.is_evaluated_():
  a.assign(a.copy_())
  