Fix leftover __init__ to run rename mishap in userbenchmark/optim (#1738)
Summary:
2 weeks ago, when working on the bisection tool, Xu had rewritten infra and moved code from __init__.py to run.py in optim benchmarks. This caused a 2 week long "sev" where no benchmarks were running cuz the run_optim_benchmarks script was not updated. The first failing instance: https://github.com/pytorch/benchmark/actions/runs/5195849856
This PR just updates it to allow the benchmarks to run again.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1738
Reviewed By: xuzhao9
Differential Revision: D46866925
Pulled By: janeyx99
fbshipit-source-id: d88275316a6176485778976ec3512f7f612554c7