Fix fx2trt broken unit test (#66696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66696
D31511082 (https://github.com/pytorch/pytorch/commit/9918fd8305dd770b467d96d91b4533477c5628ed) moved unit test but didn't add proper target in build file, fix it in this diff.
Test Plan: buck test mode/opt caffe2/test/fx2trt/converters/...
Reviewed By: 842974287
Differential Revision: D31667697
fbshipit-source-id: 49e04afa323b27a1408c9bc2b5061b6529ced985
