Remove unneeded Config namespace usages

src/Object/Image.php

@@ -6,7 +6,6 @@
 namespace Friendica\Object;
 
 use Exception;
-use Friendica\Core\Config;
 use Friendica\Core\System;
 use Friendica\DI;
 use Friendica\Util\Images;

src/Object/Post.php

@@ -7,7 +7,6 @@ namespace Friendica\Object;
 use Friendica\Content\ContactSelector;
 use Friendica\Content\Feature;
 use Friendica\Core\Addon;
-use Friendica\Core\Config;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;