[ActivityPub] Properly handle Actor URIs by using events correctly

This should fix nulls on explorer lookups inputed by postman after generate_followers/getSubscribers, that I think were caused by calling common_profile_uri that, curiously, only handles local profiles

plugins/ActivityPub/actions/apactoroutbox.php

@@ -123,7 +123,7 @@ class apActorOutboxAction extends ManagedAction
             // TODO: Handle other types
             if ($note->object_type == 'http://activitystrea.ms/schema/1.0/note') {
                 $notices[] = Activitypub_create::create_to_array(
-                    ActivityPubPlugin::actor_uri($note->getProfile()),
+                    $note->getProfile()->getUri(),
                     Activitypub_notice::notice_to_array($note)
                 );
             }