Consistent behaviour for ScopingNoticeStream $scoped

We don't guess the current profile anymore if the value of the profile === -1

Also sets $this->scoped for all ScopingNoticeStream inheritors, which just
like in an Action can be null if we're not scoped in any way (logged in).

plugins/Event/lib/eventsnoticestream.php

@@ -1,5 +1,7 @@
 <?php
 
+if (!defined('GNUSOCIAL')) { exit(1); }
+
 class RawEventsNoticeStream extends NoticeStream
 {
     function getNoticeIds($offset, $limit, $since_id, $max_id)