title_linked formatter does not work with multi-value fields (deltas)

While I am aware that the 'title_linked' formatter was probably never meant to be used on anything besides the actual title field, I have found it quite useful for some other fields. And this is where I ran into the problem that the field formatter simply always takes the first value of a field and nothing more. See the title_field_formatter_view function

function title_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
   $settings = $display['settings'];
   $output = isset($items[0]) ? $items[0]['safe_value'] : '';
   $element = array();
   ...

This seems quite pointless since the assumption behind this is simply not necessary. I propose the attached fix to allow the formatter to handle multiple deltas. The change is perfectly backwards compatible unless somebody using this is actually relying on the fact that the formatter ignores deltas.