fix(folder): prevent listing folders failure when no plain name folde…

…rs are listed,

- Converting Folder objects into plain JSONs breaks the listing usecase

src/modules/folder/folder.usecase.ts

@@ -835,7 +835,7 @@ export class FolderUseCases {
       ...folder,
       name: decryptedName,
       plainName: decryptedName,
-    }).toJSON();
+    });
   }
 
   async deleteByUser(user: User, folders: Folder[]): Promise<void> {