allow admins to edit circle details

It should be possible for admins to edit it's name, description and display name.
Again this would be necessary for Collectives.

Signed-off-by: janbaum <jan.baumgarten@tutanota.com>

Author: janbaum

lib/FederatedItems/CircleEdit.php

@@ -75,7 +75,7 @@ public function verify(FederatedEvent $event): void {
 		$circle = $event->getCircle();
 
 		$initiatorHelper = new MemberHelper($circle->getInitiator());
-		$initiatorHelper->mustBeOwner();
+		$initiatorHelper->mustBeAdmin();
 
 		$data = $event->getParams();
 		$new = clone $circle;