refactor: correct test sample

giving a sorted file is useless

Signed-off-by: 蔡略 <[email protected]>

Author: ClSlaid

crates/ide-assists/src/handlers/reorder_impl_items.rs

@@ -309,8 +309,8 @@ struct Foo;
 impl Bar for Foo {
     type T = ();$0
     const C: () = ();
-    fn a() {}
     fn z() {}
+    fn a() {}
     fn b() {}
 }
         "#,