[fx-acc][easy] Format FX experimental partitioner code (#60030)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60030
As titled. Non-functional re-format.
Test Plan: NA
Reviewed By: gcatron
Differential Revision: D29038449
fbshipit-source-id: a7c94eaab86850ef57b51ec66bfe8ea0e68d2dc8
