message: implement clippy suggestion to remove redundant `to_string`
diff: @@ -1141,9 +1141,9 @@ impl Execs {
  // Do the template replacements on the expected string.
  let matcher = match &self.process_builder {
  - None => matcher.to_string(),
  + None => matcher,
  Some(p) => match p.get_cwd() {
  - None => matcher.to_string(),
  + None => matcher,
  Some(cwd) => replace_path(&matcher, cwd, "[CWD]"),
  },
  };
  