Make clean a standalone command

src/main_native.rs

@@ -92,10 +92,8 @@ pub(crate) fn inner_main() -> Result<ExitCode> {
     }
     if cli.clean {
         commands::clean(&log_level)?;
-        if cli.files.is_empty() {
         return Ok(ExitCode::SUCCESS);
     }
-    }
 
     // Construct the "default" settings. These are used when no `pyproject.toml`
     // files are present, or files are injected from outside of the hierarchy.