Fix up an ui test

Author: topecongiro

src/test/ui/issue-32950.stderr

@@ -1,9 +1,8 @@
 error: `derive` cannot be used on items with type macros
   --> $DIR/issue-32950.rs:15:5
    |
-15 | /     concat_idents!(Foo, Bar) //~ ERROR `derive` cannot be used on items with type macros
-16 | | );
-   | |_^
+15 |     concat_idents!(Foo, Bar) //~ ERROR `derive` cannot be used on items with type macros
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error