fix(chat): Fix OpenAPI optional attributes

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Controller/ChatController.php

@@ -1116,7 +1116,7 @@ class ChatController extends AEnvironmentAwareController {
 					$data['status'] = $statuses[$data['id']]->getStatus();
 					$data['statusIcon'] = $statuses[$data['id']]->getIcon();
 					$data['statusMessage'] = $statuses[$data['id']]->getMessage();
-					$data['statusClearAt'] = $statuses[$data['id']]->getClearAt();
+					$data['statusClearAt'] = $statuses[$data['id']]->getClearAt()?->getTimestamp();
 				}
 
 				$output[] = $data;

lib/ResponseDefinitions.php

@@ -60,10 +60,10 @@ namespace OCA\Talk;
  *     id: string,
  *     label: string,
  *     source: string,
- *     status: ?string,
- *     statusClearAt: ?int,
- *     statusIcon: ?string,
- *     statusMessage: ?string,
+ *     status?: string,
+ *     statusClearAt?: ?int,
+ *     statusIcon?: ?string,
+ *     statusMessage?: ?string,
  * }
  *
  * @psalm-type TalkChatMessage = array{