registry: cleanup

src/entt/entity/registry.hpp

@@ -14,7 +14,6 @@
 #include "../container/dense_map.hpp"
 #include "../core/algorithm.hpp"
 #include "../core/any.hpp"
-#include "../core/compressed_pair.hpp"
 #include "../core/fwd.hpp"
 #include "../core/iterator.hpp"
 #include "../core/memory.hpp"