Nit: Pop model effort picker on esc (#4642)

Pops the effort picker instead of dismissing the whole thing (on
escape).



https://github.com/user-attachments/assets/cef32291-cd07-4ac7-be8f-ce62b38145f9

codex-rs/tui/src/chatwidget.rs

@@ -1633,7 +1633,7 @@ impl ChatWidget {
                 description,
                 is_current,
                 actions,
-                dismiss_on_select: true,
+                dismiss_on_select: false,
                 ..Default::default()
             });
         }