change tidy-checks from file to ''

Rely on a .clang-tidy config file by specifying `tidy-checks` option
as a blank string (''), see [0] for details.

[0] https://cpp-linter.github.io/cpp-linter-action/inputs-outputs/#tidy-checks

Signed-off-by: Junwang Zhao <[email protected]>

Author: zhjwpku

.github/workflows/cpp-linter.yml

@@ -43,7 +43,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           style: file
-          tidy-checks: file
+          tidy-checks: ''
           files-changed-only: true
           lines-changed-only: true
           thread-comments: true