Merge pull request #47119 from nextcloud/backport/47044/stable29

[stable29] fix(encryption): Fix mountpoint check to accept if several are found

lib/private/Files/Storage/Wrapper/Encryption.php

@@ -807,7 +807,7 @@ private function copyBetweenStorage(
  // first copy the keys that we reuse the existing file key on the target location
  // and don't create a new one which would break versions for example.
  $mount = $this->mountManager->findByStorageId($sourceStorage->getId());
- if (count($mount) === 1) {
+ if (count($mount) >= 1) {
  $mountPoint = $mount[0]->getMountPoint();
  $source = $mountPoint . '/' . $sourceInternalPath;
  $target = $this->getFullPath($targetInternalPath);