[FrameworkBundle] fixed form PHP templates for previous merge

src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/field_label.html.php

@@ -1 +1,2 @@
+<?php if ($required) { $attr['class'] = (isset($attr['class']) ? $attr['class'] : '').' required'; } ?>
 <label for="<?php echo $view->escape($id) ?>" <?php foreach($attr as $k => $v) { printf('%s="%s" ', $view->escape($k), $view->escape($v)); } ?>><?php echo $view->escape($view['translator']->trans($label)) ?></label>