Format.cmake directory path appears in the list of cmake-format arguments

[TheLongRunSmoke]

When Format.cmake used as submodule https://github.com/TheLartians/Format.cmake#using-git-submodules-not-suited-for-libraries its directory path appear in arguments that passed to cmake-format.

Traceback (most recent call last):
  File ".../.local/bin/cmake-format", line 8, in <module>
    sys.exit(main())
  File ".../.local/lib/python3.8/site-packages/cmake_format/__main__.py", line 625, in main
    return inner_main()
  File ".../.local/lib/python3.8/site-packages/cmake_format/__main__.py", line 608, in inner_main
    onefile_main(infile_path, args, argparse_dict)
  File ".../.local/lib/python3.8/site-packages/cmake_format/__main__.py", line 512, in onefile_main
    infile = io.open(
FileNotFoundError: [Errno 2] No such file or directory: 'Format.cmake'

How to reproduce:

1. Include as submodule.
2. Build any target, ex. fix-format