limit update to id

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

lib/Db/CacheActorsRequest.php

@@ -134,9 +134,10 @@ class CacheActorsRequest extends CacheActorsRequestBuilder {
 		} else {
 			$iconId = $actor->getIconId();
 		}
-
 		$qb->set('icon_id', $qb->createNamedParameter($iconId));
 
+		$this->limitToIdString($qb, $actor->getId());
+
 		$qb->execute();
 	}