[feature/avatars] Create setting for enabling avatar in manager

PHPBB3-10018

phpBB/includes/avatar/driver/local.php

@@ -107,7 +107,6 @@ class phpbb_avatar_driver_local extends phpbb_avatar_driver
 	public function prepare_form_acp()
 	{
 		return array(
-			'allow_avatar_local'	=> array('lang' => 'ALLOW_LOCAL',			'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => false),
 			'avatar_gallery_path'	=> array('lang' => 'AVATAR_GALLERY_PATH',	'validate' => 'rpath',	'type' => 'text:20:255', 'explain' => true),
 		);
 	}