Changing deprecated calls

Closes #3254530

modules/social_features/social_core/social_core.module

@@ -570,7 +570,7 @@ function social_core_filter_process_format($element) {
 
   // Allow module to override default filter format because some content type
   // could require specific one.
-  Drupal::moduleHandler()->alter('social_filter_format_default', $social_filter_format);
+  \Drupal::service('theme_handler')->alter('social_filter_format_default', $social_filter_format);
 
   /** @var \Drupal\filter\Entity\FilterFormat $social_filter_format */
   $social_filter_format = FilterFormat::load($social_filter_format);