gpui: Add exit in tab title update loop (#40628)

Release Notes:

- N/A

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>

crates/gpui/src/app.rs

@@ -411,7 +411,8 @@ impl SystemWindowTabController {
         for windows in controller.tab_groups.values_mut() {
             for tab in windows.iter_mut() {
                 if tab.id == id {
-                    tab.title = title.clone();
+                    tab.title = title;
+                    return;
                 }
             }
         }