[NFC] polish colossalai/nn/_ops/layernorm.py code style (#1555)

colossalai/nn/_ops/layernorm.py

@@ -19,9 +19,7 @@ def colo_layernorm(
     input_tensor = input_tensor.redistribute(ReplicaSpec())
 
     output = F.layer_norm(input_tensor, normalized_shape, weight=weight, bias=bias, eps=eps)
-    output = ColoTensor.from_torch_tensor(
+    output = ColoTensor.from_torch_tensor(tensor=output,
-        tensor=output,
+                                          spec=ColoTensorSpec(pg=input_tensor.get_process_group(),
-        spec=ColoTensorSpec(
+                                                              dist_attr=input_tensor.dist_spec))
-            pg=input_tensor.get_process_group(),
-            dist_attr=input_tensor.dist_spec))
     return output