Fix clippy lints (#4262)

* Fix clippy lints

* Fix clippy lints

* Fix clippy lints

crates/nu-engine/src/filesystem/filesystem_shell.rs

@@ -970,7 +970,7 @@ fn move_item(from: &Path, from_tag: &Tag, to: &Path) -> Result<(), ShellError> {
         } {
             Ok(_) => Ok(()),
             Err(e) => Err(ShellError::labeled_error(
-                format!("Could not move {:?} to {:?}. {:}", from, to, e.to_string()),
+                format!("Could not move {:?} to {:?}. {:}", from, to, e),
                 "could not move",
                 from_tag,
             )),

crates/nu-engine/src/script.rs

@@ -147,7 +147,7 @@ pub fn process_script(
                                 {
                                     val.to_string()
                                 } else {
-                                    format!("{}\\", name.to_string())
+                                    format!("{}\\", name)
                                 }
                             } else {
                                 name.to_string()