Merge pull request #55902 from nextcloud/backport/55827/stable32

[stable32] fix(ocm-sharing): The owner needs to be set for sharing to work

Author: nickvergessen

apps/federatedfilesharing/lib/OCM/CloudFederationProviderFiles.php

@@ -108,7 +108,7 @@ public function shareReceived(ICloudFederationShare $share) {
 
 		$token = $share->getShareSecret();
 		$name = $share->getResourceName();
-		$owner = $share->getOwnerDisplayName();
+		$owner = $share->getOwnerDisplayName() ?: $share->getOwner();
 		$sharedBy = $share->getSharedByDisplayName();
 		$shareWith = $share->getShareWith();
 		$remoteId = $share->getProviderId();