Use inclusive range

Co-authored-by: Michael Debertol <michael.debertol@gmail.com>

src/uucore/src/lib/features/entries.rs

@@ -102,7 +102,7 @@ pub fn get_groups_gnu(arg_id: Option<u32>) -> IOResult<Vec<gid_t>> {
 
 fn sort_groups(mut groups: Vec<gid_t>, egid: gid_t) -> Vec<gid_t> {
     if let Some(index) = groups.iter().position(|&x| x == egid) {
-        groups[..index + 1].rotate_right(1);
+        groups[..=index].rotate_right(1);
     } else {
         groups.insert(0, egid);
     }