refactor(src/uu/rm/src/platform/linux.rs): remove unused 'self' import from std::io

Removed the unused 'self' import from the std::io module to clean up the code and avoid potential confusion, as it was not referenced anywhere in the file. This is a minor refactoring for better maintainability.

Author: mattsu2020

src/uu/rm/src/platform/linux.rs

@@ -10,7 +10,7 @@
 use indicatif::ProgressBar;
 use std::ffi::OsStr;
 use std::fs;
-use std::io::{self, IsTerminal, stdin};
+use std::io::{IsTerminal, stdin};
 use std::os::unix::fs::PermissionsExt;
 use std::path::Path;
 use uucore::display::Quotable;