Remove duplicate line

[ROCm/rccl commit: 5782a8d857]

projects/rccl/src/collectives/device/reduce_scatter.cu

@@ -1,7 +1,6 @@
 /*************************************************************************
  * Copyright (c) 2015-2018, NVIDIA CORPORATION. All rights reserved.
  * Modifications Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved.
- * Modifications Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved.
  *
  * See LICENSE.txt for license information
  ************************************************************************/