fix one issue

Author: lrvideckis

library/data_structures_[l,r)/uncommon/priority_queue_of_updates.hpp

@@ -1,4 +1,5 @@
 #pragma once
+#include "../../../kactl/content/data-structures/UnionFindRollback.h"
 //! https://codeforces.com/blog/entry/111117
 //! @code
 //!   RollbackUF uf(n);