Fix fbgemm install checking code (#2343)
Summary:
There is an extra pair of quotes around the code checking fbgemm code installation.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/2343
Test Plan: https://github.com/pytorch/benchmark/actions/runs/9704891003
Reviewed By: q10
Differential Revision: D59136126
Pulled By: xuzhao9
fbshipit-source-id: 53911b53044213c83b334860dfe965be7585b300
