Fix various Notices

src/Protocol/ActivityPub/Processor.php

@@ -1102,7 +1102,7 @@ class Processor
 			return;
 		}
 
-		Contact::removeFollower($owner, $contact);
+		Contact::removeFollower($contact);
 		Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
 	}
 

src/Protocol/DFRN.php

@@ -1584,7 +1584,7 @@ class DFRN
 			}
 			if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
 				Logger::log("Lost follower");
-				Contact::removeFollower($importer, $contact, $item);
+				Contact::removeFollower($contact);
 				return false;
 			}
 			if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {

src/Protocol/Diaspora.php

@@ -2211,7 +2211,7 @@ class Diaspora
 				return true;
 			} else {
 				Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
-				Contact::removeFollower($importer, $contact);
+				Contact::removeFollower($contact);
 				return true;
 			}
 		}

src/Protocol/OStatus.php

@@ -471,7 +471,7 @@ class OStatus
 
 			if ($item["verb"] == Activity::O_UNFOLLOW) {
 				$dummy = null;
-				Contact::removeFollower($importer, $contact, $item, $dummy);
+				Contact::removeFollower($contact);
 				continue;
 			}