fix missing comma in activation benchmarks (#35104)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35104
I missed this in https://github.com/pytorch/pytorch/pull/34959
after a rebase, fixing.
Test Plan:
running benchmarks no longer crashes
CI
Imported from OSS
Differential Revision: D20560908
fbshipit-source-id: a5494e23953d3c9007e9874d673896291b5322e0
