Fix checking for locks in root folder

Only check up to the root of the user folder instead of the global root

Technically we should maybe even abort earlier when we found a non
encrypted folder.

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

lib/LockManager.php

@@ -125,7 +125,7 @@ public function isLocked(int $id, string $token): bool {
 		$userRoot = $this->rootFolder->getUserFolder($user->getUID());
 		$nodes = $userRoot->getById($id);
 		foreach ($nodes as $node) {
-			while ($node->getPath() !== '/') {
+			while ($node->getPath() !== $userRoot->getPath()) {
 				try {
 					$lock = $this->lockMapper->getByFileId($node->getId());
 				} catch (DoesNotExistException $ex) {