(🐞) `files` set in config file causes command `-c` mode to not work

[KotlinIsland]

[tool.mypy]
files = ["."]

👉 mypy -c 1
usage: mypy [-h] [-v] [-V] [more options; see below]              
            [-m MODULE] [-p PACKAGE] [-c PROGRAM_TEXT] [files ...]
mypy: error: May only specify one of: module/package, files, or command.

[ktbarrett]

This is still occurring and also breaks if packages is set in the config file.