Fix error following merge conflict resolution.

modules/social_features/social_post/modules/social_post_photo/src/Plugin/Block/PostPhotoGroupBlock.php

@@ -5,6 +5,7 @@
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\FormBuilderInterface;
+use Drupal\Core\Routing\CurrentRouteMatch;
 use Drupal\Core\Session\AccountProxyInterface;
 use Drupal\social_group\CurrentGroupService;
 use Drupal\social_post\Plugin\Block\PostGroupBlock;