Made codex exec resume --last consistent with codex resume --last (#9352)

PR #9245 made `codex resume --last` honor cwd, but I forgot to make the
same change for `codex exec resume --last`. This PR fixes the
inconsistency.

This addresses #8700

codex-rs/exec/src/cli.rs

@@ -119,6 +119,10 @@ pub struct ResumeArgs {
     #[arg(long = "last", default_value_t = false)]
     pub last: bool,
 
+    /// Show all sessions (disables cwd filtering).
+    #[arg(long = "all", default_value_t = false)]
+    pub all: bool,
+
     /// Optional image(s) to attach to the prompt sent after resuming.
     #[arg(
         long = "image",