Fix: Correct listing call (coscine/issues#1805)

src/Tree/Controllers/TreeController.cs

@@ -118,7 +118,7 @@ namespace Coscine.Api.Tree.Controllers
                     return BadRequest($"No provider for: \"{resource.Type.DisplayName}\".");
                 }
 
-                var fileInfos = await resourceTypeDefinition.ListEntries(null, path, resourceTypeOptions);
+                var fileInfos = await resourceTypeDefinition.ListEntries(resourceId, path, resourceTypeOptions);
 
                 var metadataInfos = new List<ResourceEntry>(fileInfos);
                 if (path.EndsWith("/"))