change module_name in chunk_test (#29589)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29589
as title
Test Plan:
```
buck run //caffe2/benchmarks/operator_benchmark/pt:chunk_test -- --iteration 1
# ----------------------------------------
# PyTorch/Caffe2 Operator Micro-benchmarks
# ----------------------------------------
# Tag : short
# Benchmarking PyTorch: chunk
# Mode: Eager
# Name: chunk_M256_N512_chunks2_cpu
# Input: M: 256, N: 512, chunks: 2, device: cpu
Forward Execution Time (us) : 148.345
# Benchmarking PyTorch: chunk
# Mode: Eager
# Name: chunk_M512_N512_chunks2_cpu
# Input: M: 512, N: 512, chunks: 2, device: cpu
Forward Execution Time (us) : 125.239
Reviewed By: hl475
Differential Revision: D18436532
fbshipit-source-id: e7100f4605471e27703b2e2e863b971a93229854
