Previous commit broke views_handler_area_result

As pointed out in the last comment in #3386717: Remove unused variables
the commit broke the views_handler_area_result

Because there is a code part

foreach ($items as $item) {
      $replacements["@$item"] = ${$item};
    }

Which fails as all the variables that it was using were removed in https://git.drupalcode.org/project/views/-/commit/0631676b3e1ee25b834139...