Fix extension manager arguments in ext_test

Author: marc1706

tests/ext_test.php

@@ -85,10 +85,9 @@ protected function create_extension_manager()
 			$container,
 			$db,
 			$config,
-			new \phpbb\filesystem\filesystem(),
+			$this->createMock('\phpbb\finder\factory'),
 			'phpbb_ext',
 			$phpbb_root_path,
-			$php_ext,
 			null
 		);
 	}