fix forgotten use DI namespaces ...

libravatar/libravatar.php

@@ -13,6 +13,7 @@ use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\Renderer;
 use Friendica\Database\DBA;
+use Friendica\DI;
 use Friendica\Util\ConfigFileLoader;
 use Friendica\Util\Strings;
 

widgets/widget_like.php

@@ -3,6 +3,7 @@
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
 use Friendica\Database\DBA;
+use Friendica\DI;
 
 function like_widget_name() {
 	return "Shows likes";