[caffe2] format video_input_op_test.py (#39381)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39381
To prepare D21832355
Test Plan: Just formatting
Reviewed By: dutran
Differential Revision: D21832354
fbshipit-source-id: bbf6a1377752adaa115ee2e2a5ba546964e3fd08
