declare config global for show_notice in streams

This is needed to get the default avatar, but it was missing.

darcs-hash:20080521133951-84dde-9d7ebbcc90086e94d1b48b33dfadcc9169f0f183.gz

lib/stream.php

@@ -28,6 +28,7 @@ class StreamAction extends Action {
 	}
 
 	function show_notice($notice) {
+		global $config;
 		$profile = $notice->getProfile();
 		# XXX: RDFa
 		common_element_start('div', array('class' => 'notice',