test(ui): clean up formatting in app.rs tests

Clean up formatting of a test assertion in app.rs to improve readability.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-31B-it-UD-Q4_K_XL.gguf)

src/ui/app.rs

@@ -853,11 +853,7 @@ mod tests {
             .unwrap();
 
         assert!(
-            !app.model
-                .category("Region")
-                .unwrap()
-                .items
-                .contains_key(""),
+            !app.model.category("Region").unwrap().items.contains_key(""),
             "records-mode edits should not create empty category items"
         );
     }