chore: clippy on redundant closure (#4058)

Add redundant closure clippy rules and let Codex fix it by minimising
FQP

codex-rs/tui/src/exec_command.rs

@@ -5,7 +5,7 @@ use dirs::home_dir;
 use shlex::try_join;
 
 pub(crate) fn escape_command(command: &[String]) -> String {
-    try_join(command.iter().map(|s| s.as_str())).unwrap_or_else(|_| command.join(" "))
+    try_join(command.iter().map(String::as_str)).unwrap_or_else(|_| command.join(" "))
 }
 
 pub(crate) fn strip_bash_lc_and_escape(command: &[String]) -> String {