Fix default DEFAULT_FILE_PATTERN in clang-tidy (#60212)
Summary:
Without the change, clang-tidy also checks folders like `.circleci/...`
Example of the clang-tidy that looked into `.circleci` changes
https://github.com/pytorch/pytorch/runs/2844682644?check_suite_focus=true
[skip ci]
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60212
Reviewed By: seemethere
Differential Revision: D29214728
Pulled By: zhouzhuojie
fbshipit-source-id: fd53f7b2f7d88936264db1effdc06cc4fc271ca4
