Add explicit parameter to IHandleUserSession->setvisitorContacts

- Convert some remaining $_SESSION references to object calls
- Address part of https://github.com/friendica/friendica/issues/12486#issuecomment-1428489772

src/Core/Session/Model/UserSession.php

@@ -140,9 +140,9 @@ class UserSession implements IHandleUserSessions
 	}
 
 	/** {@inheritDoc} */
-	public function setVisitorsContacts()
+	public function setVisitorsContacts(string $my_url)
 	{
-		$this->session->set('remote', Contact::getVisitorByUrl($this->session->get('my_url')));
+		$this->session->set('remote', Contact::getVisitorByUrl($my_url));
 	}
 
 	/** {@inheritDoc} */