Fix for CalDAV Apple Provisioning

Closes nextcloud#29433 

Signed-off-by: ITManager <github.com@itmanager.ro>

apps/dav/lib/Provisioning/Apple/AppleProvisioningPlugin.php

@@ -137,7 +137,7 @@ public function httpGet(RequestInterface $request, ResponseInterface $response):
 		$server_url = $parsedUrl['host'];
 
 		$description = $this->themingDefaults->getName();
-		$userId = $user->getUID();
+		$userId = $user->getEMailAddress();
 
 		$reverseDomain = implode('.', array_reverse(explode('.', $parsedUrl['host'])));