fix(ci) fix guardian ci (#13911)

## Summary
#13910 was merged with some unused imports, let's fix this

## Testing
- [x] Let's make sure CI is green

---------

Co-authored-by: Charles Cunningham <ccunningham@openai.com>
Co-authored-by: Codex <noreply@openai.com>

codex-rs/tui/src/chatwidget/tests.rs

@@ -6949,6 +6949,9 @@ async fn experimental_popup_includes_guardian_approval() {
     chat.open_experimental_popup();
 
     let popup = render_bottom_popup(&chat, 120);
+    #[cfg(target_os = "linux")]
+    assert_snapshot!("experimental_popup_includes_guardian_approval_linux", popup);
+    #[cfg(not(target_os = "linux"))]
     assert_snapshot!("experimental_popup_includes_guardian_approval", popup);
 }